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http://www.itu.int/rec/recommendation.asp type=items&lang=e&parent=T-REC-X.509-200003-I You ll find links to these products in the Resources section. Arguably, some risks are associated with PKI overall. An excellent document that details some of these risks is available at http://www.schneier.com/paper-pki.html.

One of the most well-known examples of the use of public-key encryption and digital signatures for securing connections are the Secure Sockets Layer (SSL) protocol and the Transport Layer Security (TLS) protocol In the example in the previous section, in which I talked about securing a Web site using public-key encryption and certificates, the protocol securing your Web site would be SSL, and you would have connected to the site by using the https prefix instead of the standard http prefix Developed by Netscape, SSL is a protocol for handling the security of message transmission over networks and most specifically the Internet SSL operates between the TCP/IP network layer and the application layer When you connect to a device or service running SSL, a handshake takes places in which the device or service presents its public certificate to the connecting party to authenticate its identity This is called server authentication.

Figure 9-4. Selecting items to generate EF classes for 8. 9. Put a check against each individual table apart from sysdiagrams. Ensure that the Pluralize or singularize generated object names checkbox is checked.

If the server and the connecting party authenticate, then all transmissions between the parties are now authenticated and encrypted using whatever encryption method you have selected, for example, RSA or DSA encryption You can also configure SSL so that the connecting party must also prove their bona fides to the device or service; this is called client authentication Similar in operation to SSL is TLS TLS was also developed by Netscape and was based on SSL version 30 It is detailed in RFC 22466 It offers significant advantages over SSL version 20, and it is slightly more secure than SSL version 30 Thus, I recommend using it over either version of SSL if your application or service supports using TLS In s 8 and 9, when I discuss using SSL/TLS to secure SMTP and IMAP/POP I focus on TLS.

Unfortunately, few Web , browsers support TLS; most of them still use SSL rather than TLS To use SSL/TLS (hereafter just referred to as TLS) on your Linux system, I will show how to implement the OpenSSL package OpenSSL is an attempt to develop a secure and robust open-source implementation of SSL (versions 20 and 30) and TLS (version 10) You can find OpenSSL at http://wwwopensslorg/ The implementation is well maintained and updated frequently, and I recommend you look at it before considering an investment in a commercial package that offers similar capabilities You can download OpenSSL from http://wwwopensslorg/source/, and I will show you how to install it..

s You should check the authenticity of the download using md5 or gpg7 to ensure you have an authentic Tip

10. Ensure the Model Namespace box is set to Models. 11. Click Finish. 12. Click OK. VS2010 will then generate EF classes for the database and display the design surface (Figure 9-5):

Before you install OpenSSL, you should check whether you already have it installed and what version it is. More so than other applications, you need to keep applications such as OpenSSL up-to-date. It is a vital component of a large number of security-related solutions on Linux systems. Vulnerabilities in OpenSSL could have spillover effects on multiple other applications and create a series of vulnerabilities and exploitable weaknesses in those applications

6. 7. http://www.ietf.org/rfc/rfc2246.txt md5 is the Message Digest algorithm developed by Prof. Ronald Rivest, and gpg is the GNU Privacy Guard utility that you can see at http:// www.gnupg.org.