Article | REF: AF173 V1

Cryptography - Algorithms

Author: Guy CHASSÉ

Publication date: July 10, 2000

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1. Classic" encryption (with secret key)

1.1 Block and serial algorithms

In "classical" cryptography (i.e. with secret keys), a distinction is usually made between stream ciphers and block ciphers:

  • the first operate on each unit of information; usually the bit, the binary digit ;

  • the latter operate on longer, fixed-size blocks, usually of a few tens of bits.

These algorithms are widely used. They are very fast, unlike most public-key algorithms (such as RSA, described in 2.2.1

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