Abstract
This chapter discusses how authentication and security, including secure password transmission, encryption, and digital signatures on data grams, are implemented under IP through the Authentication Header and Encapsulating Security Payload options. It also provides a concise introduction to IP security issues and security goals, starting with the definition of the challenges security managers are facing and the tools at their disposal. IP Security Protocol (IPsec) provides authentication services through the use of public key encryption, digital signature, and secure hashing tools; it provides privacy services through the use of public and secret key encryption as well. Security issues, security goals, encryption and authentication algorithms, IPsec, and so on are briefly described in this chapter. IPsec as defined in RFC 2401 provides security architecture for the IP—not security architecture for the Internet. It also provides an interoperable and open standard for building security into the network layer rather than at the application or transport layer.
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