Advances in Cryptology — CRYPTO '97: 17th Annual by Mikael Goldmann, Mats NÄslund (auth.), Burton S. Kaliski Jr.

By Mikael Goldmann, Mats NÄslund (auth.), Burton S. Kaliski Jr. (eds.)

This e-book constitutes the refereed complaints of the seventeenth Annual foreign Cryptology convention, CRYPTO'97, held in Santa Barbara, California, united states, in August 1997 lower than the sponsorship of the overseas organization for Cryptologic examine (IACR).
The quantity provides 35 revised complete papers chosen from one hundred sixty submissions acquired. additionally integrated are invited shows. The papers are geared up in sections on complexity concept, cryptographic primitives, lattice-based cryptography, electronic signatures, cryptanalysis of public-key cryptosystems, details thought, elliptic curve implementation, number-theoretic structures, dispensed cryptography, hash services, cryptanalysis of secret-key cryptosystems.

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You’ve already seen in this chapter that security relies on known encryption algorithms and secret keys. Those keys are simply very long random numbers. The problem with random numbers is that computers tend to be very predictable. They follow instructions to the letter. 15 This is because truly random numbers can be obtained only by observing certain physical processes. In absence of that, computers focus on collecting small 15 Some newer processors have built-in random number generators that are suitable for use in cryptography.

For example, advances in computer power could make it possible to brute-force the key. Alternatively, the key could be obtained using legal powers, coercion, bribery, or by breaking into a server that uses it. After the key compromise, it’s possible to decrypt all previously recorded traffic. Other main key exchange mechanisms used in TLS don’t suffer from this problem and are said to support forward secrecy. When they are used, each connection uses an independent master secret. A compromised server key could be used to impersonate the server but couldn’t be used to retroactively decrypt any traffic.

For example, the public key algorithm must match that used in the suite. In addition, some key exchange mechanisms depend upon certain data being embedded in the certificate, and the certificates must be signed with algorithms supported by the client. All of this implies that the server could be configured with multiple certificates (each with a potentially different chain). This Certificate message is optional, because not all suites use authentication and because there are some authentication methods that don’t require certificates.

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