I will explain it in the instructions Essay Example | Topics and Well Written Essays - 500 words - 1

I will explain it in the instructions - Essay Example   Therefore, authorizing euthanasia results to doctor-assisted death of non-critical casualties1. Conservatives like in America wants a dominion on the world .Only if Americans synergetic ally work tough, and attain the potential, then they reign as the only cost-effective and martial superpower. Other countries will befriend them, work with us and trade with them but cannot manage to contest with them, whereas, liberals don’t want the nation to be much successful as such1. Liberals  consider the action of the state governance to provide opportunities fairly to all and equality.   It is upon the government to assuage the social ills to defend social independence, entity and human rights. The essential responsibility of government is to care for the general wellness and secretive civil rights which were considered inextricably associated if not similar people concur to restrictions on their conduct by conceding to government definite imperfect powers and only if the government policy represented in both public and private rights  while on the other hand, Conservatives  holds on individual accountability, partial government, liberal markets, character autonomy, traditional2.   Believe the task of government ought to endow people with the liberty required to practice the goals of their desire. Conventional policy commonly emphasizes on strengthening individuals to handle their own questions at hand1. The importance of ideology differences became a theoretical debate just after the assertion of the occurrence in political discourse2. This is due to the fact that main components of ideology cover political behavior and use of propaganda to obtain both within and global legitimacy to be recorded since in the past. A severe methodical investigation of the ideological mechanism in intercontinental associations turned out to be promising, subsequent to two situations that were realised. To

Impact of Television Technology in Global Communication Research Paper

Impact of Television Technology in Global Communication - Research Paper Example In fact, 89% (1.42 billion) of all households worldwide have 1.6 billion TV sets with 4.2 billion (61% of the world’s total population) TV viewers (Ahonen 1). Particularly in the US, 99% of its households have TV sets and are watching at an average of four hours a day which when computed in a 65-year life would mean a total of nine years of television viewing, the A.C. Nielsen Co. says (Herr 1). â€Å"Its all-pervasiveness and instantaneity are finely tuned to our way of thinking†¦ [that] we expect from it effortless pleasure and hot news† (Peters 1).This captivating power of the television technology is essentially embedded in the very term ‘television’. Etymologically, the term ‘television’ (TV) is a combined term of different origins. The prefix ‘tele’ is from Ancient Greek that means ‘far’; the main word ‘visio’ is from Latin that means ‘sight’ or ‘seeing’. Hence, televis ion means ‘far seeing’ – a perfect term for the great miracle it offers mankind, as it amazingly extends man’s seeing capability beyond the limits of physical distance. (Stephens 46) Technically defined, â€Å"television is the electronic delivery of moving images and sound from a source to a receiver† (Noll, par.1). The receiver manipulates three kinds of different necessary information: the picture, the sound, and the synchronization. Amazingly, the picture is moving though not real but simply an optical illusion made possible by the rapid succession at 30 per second rate of slightly different still frames. (Videoforms 1) It is this experience that keep people hook up to the TV. Today, it has even become a necessity and has become an indicator of one’s socio-economic status. In fact, the global distribution of television ownership and use is illustrative of the so-called digital divide as can be seen in the following data. The Industrialize d World has 630 million TV sets in 470 million households with only 1.05 billion viewers, hence a ratio of 1.3 TV set for every household and a ratio of 1.6 viewers for every TV set. On the other hand, the Emerging World has 970 million TV sets in 950 million households but with 3.15 billion viewers, exactly three times larger than that of the Industrialized World, hence a ratio of only 1 TV set for every household and a ratio of 3.24 viewers for every TV set. Also, 34% of households in the Industrialized World own 2 or more TV sets; whereas, only 2% of households in the Emerging World own 2 or more TV sets. (Ahonen, par. 4) 1 The Evolution of Television How could a lifeless entertainment device greatly impact global communication? Understanding the evolution of TV from its inception to its current form (see Appendix) will help clarify this unexpected phenomenon. The television technology had its humble and skeptical beginnings, but except for the Internet is the 20th centuryâ€℠¢s most influential invention, Monaghan argues (1). Even its own inventors may not have imagined the development it has reached today and the further development it could reach in the future. The invention of the television cannot be attributed to a single person but many individuals (Bellis, â€Å"The Invention of Television† 1) whose works and accidental discoveries on optical, mechanical and

European Union Single Currency Policy Essay Example | Topics and Well Written Essays - 3000 words

European Union Single Currency Policy - Essay Example This paper illustrates that the European â€Å"dollar hegemony, thawed out frozen masses of immobilized capital, increased the volume and value of international trade, and opened and expanded markets on a vast scale. It created pressures that, if not irresistible, at least required better and more tenacious defenses, opened horizons beyond anything previously imaginable, yet also posed new regulatory challenges†. There are many advantages and disadvantages in implementing a change of work, place, policy, statute, condition or environment. There are successes, failures, and depression brought about by the fluctuations in a currency's market price. The following paragraphs explain the nuances of the single currency European Union economy and other related topics which are pegged on the European Union Dollar. European Union single currency policy is beneficial to its member countries. The potential benefits, as well as expenditures of the single European Monetary Unit, had been d iscussed at length in the European Commissions study entitled One Market, One Money. This report gave four major benefits that the single currency would bring to European Union member countries. The first benefit is the reduction in transaction costs. The second benefit is the reduction in risk. The third benefit would be the increase in competition. The last benefit would be the emergence of an international currency to compete on equal footing with the United States dollar. The first benefit is the reduction in transaction costs. The reduction of the transaction costs is connected with the decrease in the need to exchange the currency when one European Union Country like the United Kingdom would have to endure when buying a car from Germany, another European Union member state. Some of the members of the European Union include Sweden, Finland, Latvia, Lithuania, Denmark, United Kingdom, Ireland, Germany, Belgium, Luxemburg, France, Portugal, Spain, Italy, Austria, Hungary, Romania , Bulgaria, Poland and Slovenia.

Impact of Television Technology in Global Communication Research Paper

Impact of Television Technology in Global Communication - Research Paper Example In fact, 89% (1.42 billion) of all households worldwide have 1.6 billion TV sets with 4.2 billion (61% of the world’s total population) TV viewers (Ahonen 1). Particularly in the US, 99% of its households have TV sets and are watching at an average of four hours a day which when computed in a 65-year life would mean a total of nine years of television viewing, the A.C. Nielsen Co. says (Herr 1). â€Å"Its all-pervasiveness and instantaneity are finely tuned to our way of thinking†¦ [that] we expect from it effortless pleasure and hot news† (Peters 1).This captivating power of the television technology is essentially embedded in the very term ‘television’. Etymologically, the term ‘television’ (TV) is a combined term of different origins. The prefix ‘tele’ is from Ancient Greek that means ‘far’; the main word ‘visio’ is from Latin that means ‘sight’ or ‘seeing’. Hence, televis ion means ‘far seeing’ – a perfect term for the great miracle it offers mankind, as it amazingly extends man’s seeing capability beyond the limits of physical distance. (Stephens 46) Technically defined, â€Å"television is the electronic delivery of moving images and sound from a source to a receiver† (Noll, par.1). The receiver manipulates three kinds of different necessary information: the picture, the sound, and the synchronization. Amazingly, the picture is moving though not real but simply an optical illusion made possible by the rapid succession at 30 per second rate of slightly different still frames. (Videoforms 1) It is this experience that keep people hook up to the TV. Today, it has even become a necessity and has become an indicator of one’s socio-economic status. In fact, the global distribution of television ownership and use is illustrative of the so-called digital divide as can be seen in the following data. The Industrialize d World has 630 million TV sets in 470 million households with only 1.05 billion viewers, hence a ratio of 1.3 TV set for every household and a ratio of 1.6 viewers for every TV set. On the other hand, the Emerging World has 970 million TV sets in 950 million households but with 3.15 billion viewers, exactly three times larger than that of the Industrialized World, hence a ratio of only 1 TV set for every household and a ratio of 3.24 viewers for every TV set. Also, 34% of households in the Industrialized World own 2 or more TV sets; whereas, only 2% of households in the Emerging World own 2 or more TV sets. (Ahonen, par. 4) 1 The Evolution of Television How could a lifeless entertainment device greatly impact global communication? Understanding the evolution of TV from its inception to its current form (see Appendix) will help clarify this unexpected phenomenon. The television technology had its humble and skeptical beginnings, but except for the Internet is the 20th centuryâ€℠¢s most influential invention, Monaghan argues (1). Even its own inventors may not have imagined the development it has reached today and the further development it could reach in the future. The invention of the television cannot be attributed to a single person but many individuals (Bellis, â€Å"The Invention of Television† 1) whose works and accidental discoveries on optical, mechanical and

Research Report Essay Example | Topics and Well Written Essays - 3250 words

Research Report - Essay Example This saves the time that they would take in going to the ticket sale points in order to acquire them. This has also reduced the cases of theft by various parties involved in the processes of the designing of the manual tickets as most of them print extra ticked for sale without the knowledge of the management of the clubs (Benun, 2007, p.79). The money that they get from such activities go directly into their own pockets and this denies the clubs a lot of revenue. This is what has led to many companies and football teams adopting the technology of online ticketing for the purposes of saving time, money as well as maximizing on the revenue. The use of this technology also helps the clubs in knowing their members easily as fans are in a position of subscribing to the club’s website in order to gain membership. The fans are given their login details that they use to enter the website. After they have given their details, they are also notified through SMSs that are sent to them i nforming them of the upcoming matches and the ticketing information. This gives the fans in knowing when and where their team will be playing without having to rely on news from the mainstream media (Clark, 2003, p.48). The clubs are also able to sale their products such as merchandize through their website as the payments are done online and then delivery is done. Currently, nearly all the big clubs sale their tickets online and the sales can start as early as a week earlier before the kick off. In the website, the fans can acquire membership by creating their own accounts that they are identified with. The importance of the membership programs is that it gives them priority in matters ticketing as they become the first ones to get their tickets before the non-members. This can also give them the advantage of getting the tickets at cheaper prices as compared to the non-members. Literature review. Some websites are designed in a manner such that before one logs into the website, the y receive some messages that contain the codes that they use to enter (Krug, 2000, p.93). These are purposely for security to avoid things such as hacking. This also helps in avoiding things such as ticket broking whereby some other business people buy the tickets from the club at affordable rates and then sell them to other people at their own set price. This has the effect of locking out some fans from the stadium who cannot afford their ticket prices or even denying the club its revenue as potential clients are discouraged by the exorbitant prices set by the brokers, thinking that they are the clubs’ agents (Slatin, and Rush, 2002, p.78). Communication through SMS has been on a steady increase in personal matters, business and even purposes of information. Presently, many innovative applications are built on top of the technology of SMS and even development of more. Several organizations in the countries that are more developed have started using SMS services in interactio n with members and also sending notifications and alerts (Mueller, and Mueller, 2003 p.67). The major advantages of this technology is receiving and sending information to people and groups. Application of the SMS in web-based ecommerce The technology of SMS is now being applied in several organizations for delivery of their services in a more efficient and effective manner. The technology could be used in the provision of easy and quick access to the website of

Ipsec implementation

Ipsec implementation There are many methods to IP Security. In the Microsofts Windows 2003 the server version, there are many such techniques and tweaks which are useful to help provide a secure base to the system. The operating system is very good in protecting the system from attacks which may be active attacks or in some cases passive attacks. The procedures for IPSec are placed properly into the system which helps it tackle such attacks. This is possible by providing a secure packet filter for packet transport and also using cryptography. This technology is very in high use for communication types like host to host, router to router, gateway to gateway, site to site and also in virtual private networks. Some other places for successful implementation are secure servers. The IPSec comes as a basic Group Policy controlled by Dos Prompt commands and it also has user interface with custom programs installed. The implementation of IPSec involves these steps: Overview of IPSec Deployment Determining Our Internet Protocol Security targets Preparing a Internet Protocol Security Policy Implementation of the designed policies Overview of IPSec Deployment: There are many techniques such as usage of cryptography and authentication software to secure the communication in a network. The connection may be between two parties or between a group of users. Security is to make sure that the communication is not broken, the communication is not intervened and the data is not altered. The Internet Protocol Security has some features which help running a secure transmission. IPSec has set procedures which help achieve these ends. Today there are many companies and it is getting harder day by day to ensure the security of such humungous networks with a heavy workload on the networks. It is also very hard to track any attacks on the network in millions and millions of request. Using firewalls to protect a network did work for some days but it has proved to be impractical as it has no proper rules to detect intrusions or attacks. The advent of IPSec is a leap in computer and network security. This protocol has a wide spectrum of features which are strong enough to contain such high volume of network requests and also handle intrusions. The Internet Protocol for Security is not a versatile detection protocol. It is capable of managing most of the policies to grant or reject, block and negotiate the traffic in a network. This can also be permitted to a specific set of addresses or in some cases protocol and also a different policy to each port. It is recommended that we use ICF (Internet Connection Firewall) when we are in need of a firewall which is capable of providing a network interface for very big networks. This is because the internet protocol for Security has a very strict and a very stern strategy which is based on static filtering based on IP addresses. But this is it is totally different in the case of the Internet Connection Firewall. The ICF has policies which has a set of filter for all the addresses which are capable of being accessed. The Internet Protocol for Security can be used when the restriction is only to a particular set of addresses or the communication between a group of computers. There are many ways to use IPSec in a network but the best way is bye using a directory with all the domains and also a GP when needed. Some areas of interest when implementing IPSecurity: The decision of where we must secure computers and how on our network which can be done by running a group of systems in a directory which is also called as the Active Directory Organisational Units or OUs. The next step is to determine the strength of the policies we assign. Determining Our Internet Protocol Security targets: The first step in deploying IPSec on our server or the network can be done properly by deciding which set of systems are in dire need of security. There are surely some places on the network which are in a need of higher security than the other sections. It is for sure that IPSec is capable of providing optimal security but the problems starts when the network slows down due to the excessive data to be processed and also a large number of systems for IPSec to follow and maintain. In some cases, there are systems which are not upgraded to be able to support the IPSecurity. Determining Your IPsec Needs In beginning of the protocol design procedure, proper planning should be done to make sure that our current network environment available for use. It is always helpful to have a set of the network topology with all of its hardware and software components. This procedure is of high importance mainly in the designing procedure. IPSecurity is highly vulnerable to a network topology. There are many network topologies in which IPSec is not well suited. Preparing a Internet Protocol Security Policy: As said earlier, there are many network topologies which are not suitable to the default structure of the IPSec policies. There is a need to develop a custom IPSec set of policies well suited for the current network. Some organisations can run their network with a small set of policies. But in companies with a very huge network, there are many policies which are to be implemented properly and also a stringent structure is to be maintained. Steps below shows how IP Sec policies work. Designing IPsec Policies There might be some cases where the company or the organisation is interested in implementing a policy which sets a secure communication between two specified computers. This can be done by restricting all traffic and adding exceptions which relates to these two systems. This method can be done vice versa. A network can be setup with policies to allow all requests and block specific ports or computers. To implement such exceptions, a thorough analysis of the network is clearly needed. Computer roles: Security for Data Transmission: Security needs are different from each and every data packet transmitted. The security policies are also very different. There are many levels in this instance. When considering encryption, there are many types such as AES, DE5, RSA and many more. RSA is the best encryption software available presently. These programs can be used to secure files on transmission, on a network or even in the system. Operating System Computers: IPSecurity is a very unique technique used to implement security in a network. There are many operating systems which are not so advanced to implement IPSec. There is no support for IPSec. But there are many operating systems which are capable of running IPSec in transport mode. Some other cases, the policies are stored locally which makes it easier to decide as the implementation doesnt take long enough. In some cases, IPSec policies are implemented through the Group Policy. General IPSec Policy Settings General IPSec policy settings must be specified whether we want the policy to provide packet filtering or end-to-end networks. IPSec Rules IPSec rules determine which traffic is affected by an IPSec policy and which actions take place when that type of traffic is encountered. Table6.5 describes the contents of IPSec rules that two computers use to establish a secure, authenticated channel. Specifies a named list of filters. Each filter in the filter list specifies the types of traffic to which the filter action is applied. Filters can be defined to match specific IP protocols, source and destination TCP and UDP ports, and source and destination IP addresses. The filter list name might include the version number, the last update time, and the administrative owner. Each computer discards the filter list name during policy processing. Filter action Specifies whether a packet is permitted, blocked, or secured. If packets are to be secured, specifies how they are secured. A list of security methods specifies the security protocol, cryptographic algorithm, and session key regeneration frequency. Request Security Authentication methods One or more authentication methods, which are specified in order of preference. Available options are KerberosV5, certificate, or preshared key. Specifies whether to use tunnel mode and, if so, the tunnels endpoint. Specifies whether the rule applies to LAN connections, remote access connections, or both. Assigning IPSec Policies: As a domain administrator, we can configure IPSec policies to meet the security requirements of a user, group, application, domain, site, or global enterprise from a domain controller. IPSec policy can also be implemented in a non-Windows2000-based domain environment by using local IPSec policies. Deploying Our IPSec Solution: After scoping our needs, building IPSec policies, and determining our strategy for assigning the policies to specific OUs, test the IPSec policies in a lab environment and conduct a pilot project before rolling them out for production use. To ensure that IPSec policy functions as expected and provides the appropriate level of security, test specific IPSec policy configurations on clients and servers in a lab environment, and then conduct pilot or beta tests in a limited operational environment before conducting a full-scale deployment. A Cryptographic Evaluation of IPsec: Even with all the serious critisisms that we have on IPsec, it is probably the best IP security protocol available at the moment. We have looked at other, functionally similar, protocols in the past (including PPTP [SM98, SM99]) in much the same manner as we have looked at IPsec. None of these protocols come anywhere near their target, but the others manage to miss the mark by a wider margin than IPsec. This difference is less significant from a security point of view; there are no points for getting security nearly right. From a marketing point of view, this is important. IPsec is the current best practice, no matter how badly that reects on our ability to create a good security standard. Our main criticism of IPsec is its complexity. IPsec contains too many options and too much exibility; there are often several ways of doing the same or similar things. This is a typical committee efiect. Committees are notorious for adding features, options, and additional exibility to satisfy various factions within the committee. As we all know, this additional complexity and bloat is seriously detrimental to a normal (functional) standard. However, it has a devastating efiect on a security standard. It is instructive to compare this to the approach taken by NIST for the development of AES [NIST97a, NIST97b]. Instead of a committee, NIST organized a contest. Several small groups each created their own proposal, and the process is limited to picking one of them. At the time of writing there has been one stage of elimination, and any one of the five remaining candidates will make a much better standard than any committee could ever have made. The Complexity Trap: Securitys worst enemy is complexity. Complexity of IPsec In our opinion, IPsec is too complex to be secure. The design obviously tries to support many difierent situations with difierent options. We feel very strongly that the resulting system is well beyond the level of complexity that can be analysed or properly implemented with current methodologies. Thus, no IPsec system will achieve the goal of providing a high level of security. IPsec has two modes of operation: transport mode and tunnel mode. There are two protocols: AH and ESP. AH provides authentication, ESP provides authentication, encryption, or both. This creates a lot of extra complexity: two machines that wish to authenticate a packet can use a total of four difierent modes: transport/AH, tunnel/AH, transport/ESP with NULL encryption, and tunnel/ESP with NULL encryption. The difierences between these options, both in functionality and performance, are minor. The documentation also makes it clear that under some circumstances it is envisioned to use two protocols: AH for the authentication and ESP for the encryption. Modes As far as we can determine, the functionality of tunnel mode is a superset of the functionality of transport mode. (From a network point of view, one can view tunnel mode as a special case of transport mode, but from a security point of view this is not the case.) The only advantage that we can see to transport mode is that it results in a somewhat smaller bandwidth overhead. However, the tunnel mode could be extended in a straightforward way with a specialized header-compression scheme that we will explain shortly. This would achieve virtually the same performance as transport mode without introducing an entirely new mode. We therefore recommend that transport mode be eliminated. Recommendation 1 Eliminate transport mode. Without any documented rationale, we do not know why IPsec has two modes. In our opinion it would require a very compelling argument to introduce a second major mode of operation. The extra cost of a second mode (in terms of added complexity and resulting loss of security) is huge, and it certainly should not be introduced without clearly documented reasons. Eliminating transport mode also eliminates the need to separate the machines on the network into the two categories of hosts and security gateways. The main distinction seems to be that security gateways may not use transport mode; without transport mode the distinction is no longer necessary. Protocols The functionality provided by the two protocols overlaps somewhat. AH provides authentication of the payload and the packet header, while ESP provides authentication and confidentiality of the payload. In transport mode, AH provides a stronger authentication than ESP can provide, as it also authenticates the IP header fields. One of the standard modes of operation would seem to be to use both AH and ESP in transport mode. In tunnel mode, ESP provides the same level of authentication (as the payload includes the original IP header), and AH is typically not combined with ESP [KA98c, section 4.5]. (Implementations are not required to support nested tunnels that would allow ESP and AH to both be used in tunnel mode.) One can question why the IP header fields are being authenticated at all. The authentication of the payload proves that it came from someone who knows the proper authentication key. That by itself should provide adequate information. The IP header fields are only used to get the data to the recipient, and should not afiect the interpretation of the packet. There might be a very good reason why the IP header fields need to be authenticated, but until somebody provides that reason the rationale remains unclear to us. The AH protocol [KA98a] authenticates the IP headers of the loour layers. This is a clear violation of the modularization of the protocol stack. It creates all kind of problems, as some header fields change in transit. As a result, the AH protocol needs to be aware of all data formats used at loour layers so that these mutable fields can be avoided. This is a very ugly construction, and one that will create more problems when future extensions to the IP protocol are made that create new fields that the AH protocol is not aware of. Also, as some header fields are not authenticated, the receiving application still cannot rely on the entire packet. To fully understand the authentication provided by AH, an application needs to take into account the same complex IP header parsing rules that AH uses. The complex definition of the functionality that AH provides can easily lead to security-relevant errors. The tunnel/ESP authentication avoids this problem, but uses more bandwidth. The extra bandwidth requirement can be reduced by a simple specialized compression scheme: for some suitably chosen set of IP header fields X, a single bit in the ESP header indicates whether the X fields in the inner IP header are identical to the corresponding fields in the outer header.2 The fields in question are then removed to reduce the payload size. This compression should be applied after computing the authentication but before any encryption. The authentication is thus still computed on the entire original packet. The receiver reconstitutes the original packet using the outer header fields, and verifies the authentication. A suitable choice of the set of header fields X allows tunnel/ESP to achieve virtually the same low message expansion as transport/AH. We conclude that eliminating transport mode allows the elimination of the AH protocol as well, without loss of functionality. We therefore recommend that the AH protocol be eliminated. IPSEC methodology using different operating systems: IPSEC is a framework for security that operates at the Network Layer by extending the IP packet header. This gives it the ability to encrypt any higher layer protocol, including TCP and UDP sessions, so it offers the greatest flexibility of all the existing TCP/IP cryptosystems. While conceptually simple, setting up IPSEC is much more complex that installing SSH, for example. IPSEC also has the disadvantage of requiring operating system support, since most O/S kernels dont allow direct manipulation of IP headers. Linux IPSEC support (the FreeS/WAN project), for example, isnt included in the standard kernel distribution for this reason, and has to be applied as an add-on. Furthermore, putting the cryptography in the kernel isolates it from the application, making it more difficult to code crypto-aware software. Using SSL, for example, simply requires linking a library into the application and allows the application to easily query what certificates have been used to authenticate a client. IPSEC defines a Security Association (SA) as its primitive means of protecting IP packets. An SA is defined by the packets destination IP address and a 32-bit Security Parameter Index (SPI), that functions somewhat like a TCP or UDP port number. SAs can operate in transport mode, where the IPSEC data field begins with upper level packet headers (usually TCP, UDP, or ICMP), or in tunnel mode, where the IPSEC data field begins with an entirely new IP packet header, ala RFC 2003. Furthermore, SAs can be encapsulated within SAs, forming SA bundles, allowing layered IPSEC protection. For example, one SA might protect all traffic through a gateway, while another SA would protect all traffic to a particular host. The packets finally routed across the network would be encapsulated in an SA bundle consisting of both SAs. A common use of IPSEC is the construction of a Virtual Private Network (VPN), where multiple segments of a private network are linked over a public network using encrypted tunnels. This allows applications on the private network to communicate securely without any local cryptographic support, since the VPN routers perform the encryption and decryption. IPSEC is well suited for this environment, more so than tunneling PPP over SSL or SSH, since it operates directly on the IP packets and preserves a one-to-one correspondence between packets inside and outside the network. In the case of tunneling PPP over an encrypted TCP connection, any packet loss in the public network would trigger a TCP retransmission, stalling the link until the packet was delivered. In particular, running Voice Over IP (VoIP) traffic through a TCP/PPP tunnel would largely defeat the RTP protocol used for VoIP; IPSEC is better suited in this case. IPsec Development for Linux: In the Linux IPv4 IPsec world, a lot of people use FreeS/WAN projects implementation. It consists of an inkernel IPsec processing part, Key Exchange daemon Pluto and some utility commands/scripts. To run Pluto with small changes on our IPsec kernel implementation and reduce impact for user who use FreeS/WAN implementation, we have decided to keep compatibility with FreeS/WANs IPsec programming interface between kernel and userland. For this, we use the same PF KEY interface which FreeS/WAN project extended. In kernel IPsec packet processing part, we developed AH, ESP, SAD and SPD from scratch. PF KEY interface PF KEY(v2), which is described in RFC2367, is key management API mainly for IPsec. PF KEY is used for handling the IPsec Security Association Database. Additionally we have to handle the IPsec Security Policy Database, but there is no standard for the IPsec Security Policy management API. In FreeS/WAN implementation, PF KEY interface is extended to manage the IPsec Security Policy Database. Our kernel 2.4 IPsec implementation also uses the same PF KEY interface as FreeS/WANs one. It is important to be able to run the FreeS/WANs userland application (e.g., Pluto) with small changes. Encryption and Authentication algorithm We provide HMAC-SHA1 and HMAC-MD5 for authentication, NULL, DES-CBC, 3DES-CBS and AES for encryption. We thought encryption and authentication algorithm is not only used by IPsec and there are many algorithms so that we consider encryption and authentication algorithm and those interface should have good modularity. We adopted cipher modules which provided by CryptoAPI Project. Security Association and Security Policy SA and SP themselves dont depend substantially on the IP version. FreeS/WAN project architecture depends on their special virtual network interface for IPsec because it might focus on IPv4 tunnel mode (Their implementation also provides IPv4 transport mode). Their SA, SP, SAD and SPD also depend on their special virtual network interface. We considered and decided it was not suit to IPv6 because the IPv6 stack needed the neighbor discovery and the auto address configuration in its basic specification. If we had implemented IPv6 IPsec stack with their architecture, we had to implement those basic specification in their special virtual network interface. Therefore we implemented our own SAD and SPD in order to handle both IPv4 and IPv6. To improve the system performance, Each database will be locked by smallest granularity. And in many cases we use the read lock. SA and SP are managed by the reference counter to prevent used SA from removing by accident. IPsec Packet Processing Output There are various packet output paths from the IP(v4/6) layer to the network driver layer in Linux kernel networking stack (TCP, UDP/ICMP, and NDP[10] for IPv6). The packets which may be applied IPsec will go through these paths. We had to add IPsec functionality for these output paths, e.g, in IPv6 ip6 xmit() for TCP, ip6 build xmit() for UDP/ICMP and ndisc send ns()/ndisc send rs() for neighbor discovery packets. Output process is as follows): check IPsec SP lookup the IPsec SA by the IPsec SP apply IPsec processing to the packet output the packet to the network driver layer To reduce SA searhing time, we link the SP and the found SA after lookup from the first time. Input At input, there is only path for IP packets. We added IPsec processing part in ip6 input finish. Input process is as follows: receive the packet lookup the IPsec SA by SPI(which resides in AH/ESP header) check integrity and decrypt check IPsec Policy. IPsec Tunnel mode We are using IPv6-over-IPv6(and IPv4-over-IPv4) virtual tunnel device to implement IPsec tunnel mode. This implementation can avoid to duplication code of encapsulation/ decapsulation outer IP header compairing with having these code in the IPsec processing part itself. The virtual tunnel device is not different from the normal IP-over-IP virtual tunnel device in Linux. 4 IPsec implementation for kernel 2.6 The most important difference between ours and them is SAD/SPD part. They thought the whole SPD/SAD mechanic should be flow cache based lookup system shared by IPv4 and IPv6. One month later, they introduced the new network architecture called XFRM to Linux kernel 2.5. At first their developing code lacked IPv6 IPsec only for IPv4 IPsec. In order to suport IPv6 IPsec, we have implemented IPv6 IPsec code based on XFRM (and discarded our original code). PF KEY interface The PF KEY interface of Linux kernel 2.6(and 2.5) is compatible with KAME[3] PF KEY interface. We can use setkey command for configuring SA and SP and Racoon for IKE. Additionally we can add IPsec Policy each socket via Netlink3. They have suported only IPv4 in their first code, we have added IPv6 support. Security Association and Security Policy On the XFRM architecture, IPsec SP, which is represented as xfrm policy structure, will be bound to the routing flow cache (and IPsec policy will point IPsec SA bundle) and IPsec SA, which is represented as xfrm state structure, is included in destination cache, dst entry structure. The chaining destination cache means IPsec SA bundle. IPsec Packet Processing Output The output part of the XFRM architecture is placed between the IP layer and the network driver layer. In general, non IPsec packet will be passed to the network driver layer by a single destination output function, which is resolved routing lookup. But IPsec packet will be need to apply some IPsec processing (e.g., encryption, hash). XFRM functions make a chain of destination output functions (We call Stackable Destination, as shown in Figure3). Each function match each IPsec processing (AH, ESP and IPcomp[11]). To be more specific, in order to pass a packet to the network driver layer we have to do as follows. lookup routing table to decide output function by ip6 route output lookup IPsec Security Policy lookup IPsec Security Association(s) suitable for IPsec Security Policy and create destination chain to apply IPsec, pass a packet to the destination chain Input The input part of the XFRM architecture is simpler than output. The XFRM input function is handled as same as upper layer protocols like TCP, UDP, etc. In IPv6, IPsec headers are defined as IPv6 extension header but IPsec input functions are handled as an upper layer protocol handler. As the result of introducing IPv6 IPsec input processing in Linux. kernel, inconsistencies existed between IPsec headers and other IPv6 extension headers. In order to resolve this, we moved to the other IPv6 extension header handler functions to upper layer protocol handler. In detail, we registered IPsec header (both AH and ESP) handler functions with upper layer protocol handler array inet6 protos. Incoming IPsec packet processing flow is as follows: process IP packet from IP header in sequence process IPsec part (check integrity and decrypt) if founded check IPsec Security Policy pass IP packet next handler IPsec Tunnel mode Linux kernel 2.6 IPsec tunnel mode doesnt use the virtual tunnel device to create tunnel. The IPsec stack builds the outer IP header during IPsec processing by itself. IPSec Best practices Best practices IPSEC in transport mode has some serious advantages over other solutions. Compared to other technologies, IPSEC is built into to the Linux kernel. In other words there is nodaemonrunning in the background. Better yet, IPSEC does not require port-forwarding; some people elect to useSSH, stunnel, and other technologies that rely onport forwarding. With IPSEC, you simply have to run a program and its configuration file. After running it,encryptionbetween hosts is mandatory. Connections will be refused if the other connection does not have the appropriate keys. Groups of computers can share the same key, and it can even be done on a per-port setting (for example securing VNC, etc). Downsides? IPSEC in transport mode does have a couple draw backs. In transport mode you cannot have any dynamic setups where the IP addresses change from time to time. In other words, IPSEC is usually insufficient for workstation environments or dynamically assigned networks. Also, if you want to do a per-port setup the configuration becomes harder. Security Implications A very astute user can use IPSEC to bypass firewalls and other security measures. Since IPSEC uses cryptography, information is passed between machines in encrypted format. If the keys are not known, there is no practical way to decrypt the information (it is virtual impossible due to the sheer amount of time it would take). Machine-to-Machine IPSEC installations should be considered as Virtual Private Networks (VPNs) for security considerations. Please check with yoursystem administrator, business policies, and laws and regulations of your locality in order to establish whether or not to institute IPSEC. Requirements ipsec-tools package static IP addresses for each machine Configuration file The configuration file, /etc/setkey.conf, contains the information about the IPSECpolicy. Below is a sampleconfiguration policy(i.e. dont implement this policy because it is insecure). These lines are the actual keys and the encryption that will be used. The first block has the keys that will be used for authentication. In this case, it is the hmac-md5algorithm. The second block contains the keys that will be used for privacy, and the method of encryption. In the example, AES-CBC will be used, which is probably stronger than should be required; the key that we will be using is 194bits, meaning that it is good enough for US Government Secret and below classifications. The final block includes the actual policy. This is where you can put port numbers and even define whether it will be TCP orUDP. Generating the keys The more random the key, the better. Obviously, the example above is insufficient to secure a network. The following command will generate a random key. While running this command, youll need to wiggle the mouse to make it run faster. Or, if you are using a terminal use/dev/urandom instead. dd if=/dev/random count=16 bs=1| xxd -ps Depending on the size of the key that you want, adjust the count (16 will produce a 128 bit key, 24 will produce a 196 bit key, and 32 will produce a 512 bit key) The size of the key is important. If you really paranoid or just haveCPUcycles to

Educational Philosophy :: Education Teaching Teachers Essays

Educational Philosophy â€Å"Let’s play school?† So many times when I was growing up would I pose this question to my younger brother. I would always play the role of the teacher and he would be my somewhat enthused student. Of course, childhood never lasts forever and the unforgiving world of adolescence greets us. I was a miserable thirteen year old, wishing for those days of pretending, while I suffered the torments of a bully and had the feeling that I would never be accepted or fit in. I wondered, would my peers ever treat me equally? Would I ever be able to be what society says a young woman should be? It was during this trying time that I realized my childhood game, coupled with my desire to make kids feel good about themselves, was my destined career choice. I was destined to be an educator. As time passed and I entered college I realized that with the ideas of Progressivism and Social Reconstructionism that I was meant to be a teacher who would teach kids facts and formulas and teach them self worth in the process. To me, school is much more than a place to learn about history and math and reading, it’s a place to grow socially and emotionally. I believe it is vitally important to teach character development and self worth at an early age. This way, by the time a child hits puberty, they have a sense of self-pride, they feel they have a special gift or talent that makes them unique and important in society. Perhaps if I had had an elementary school teacher who taught me these things, then middle school wouldn’t have been such a difficult struggle for me. Many future teachers I speak with say that they want to teach out of West Virginia. They say they want to teach in a big city where they can get a high paying teachers job. But you can’t put a price tag on education; children here in the mountain state need young, dynamic teachers with fresh ways of thinking, as current teachers reach retirement age. This is why I want to teacher in West Virginia.