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By B. John Zavrel

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A secure construction is the HMAC by Krawczyk, Bellare and Canetti [16, 158]. It is constructed by invoking the MDC function twice. The data used as input of the outer MDC function, is not known to the attacker, as it is the output of the internal MDC function to which the original data and the secret key is supplied. 5). Another construction is the MDx-MAC by Preneel and van Oorschot. The interested reader is referred to [202] for more information. 3 Digital Signature. Public-key techniques can also be used for other purposes than for encrypting information.

The timestamp mechanism has several drawbacks: • The clocks of all parties concerned need to be synchronized; • The system clock becomes a security critical element that must be well protected; • All parties need to store a certain amount of the recent messages. 36 PRACTICAL INTRANET SECURITY Nonces. A nonce is usually defined as a number that is used never more than once. Sometimes the term nonce and random number are viewed as synonyms but this is not always valid. Nonces may have a certain degree of randomness but they do not always need to be random to fulfill their purpose in the protocols.

The most popular is the Crack (v50a) package. We recommend that system administrators run this software at regular intervals and take appropriate action. AUTHENTICATION AND KEY MANAGEMENT 27 3. Password replay: the UNIX password protection is static. This means that the same password is used every time a user attempts to log into the system (although it should be common practice to have users change their password regularly). With any static authentication mechanism, an intruder in the system can just replay the access token to gain access.

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