Network security : know it all by James B D Joshi; et al

By James B D Joshi; et al

Community defense: comprehend it All explains the fundamentals, describes the protocols, and discusses complicated subject matters, via the easiest and brightest specialists within the box of community safety. Assembled from the works of major researchers and practitioners, this best-of-the-best selection of chapters on community protection and survivability is a beneficial and convenient source. It consolidates content material from the fields top experts Read more...

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IPsec provides three degrees of freedom. First, it is highly modular, allowing users (or more likely, system administrators) to select from a variety of cryptographic algorithms and specialized security protocols. Second, IPsec allows users to select from a large menu of security properties, including access control, integrity, authentication, originality, and confidentiality. , all packets flowing between a pair of gateways). When viewed from a high level, IPsec consists of two parts. The first part is a pair of protocols that implement the available security services.

In this protocol, Alice again sends Bob a digitally signed message with a timestamp and her identity. Because their clocks aren’t synchronized, Bob cannot be sure that the message is fresh. Bob sends back a digitally signed message with Alice’s original timestamp, his own new timestamp, and his identity. Alice can verify the freshness of Bob’s reply by comparing her current time against the timestamp that originated with her. 10 The Needham-Schroeder authentication protocol. timestamp and a new session key encrypted using Bob’s public key.

If a message is not original and timely, then from a practical standpoint we want to consider it as not being authentic, not being from whom it claims to be. And when is it more critical to be sure whom a message is from than when you are arranging to share a new session key? Usually, authentication protocols establish a session key at the same time, so that at the end of the protocol Alice and Bob have authenticated each other and they have a new symmetric key to use. Without a new session key, the protocol would just authenticate Alice and Bob at one point in time; a session key allows them to efficiently authenticate subsequent messages.

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