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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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Classic" encryption (with secret key)
Public key encryption
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- - La lecture de cet article suppose du lecteur une certaine familiarité avec les structures algébriques (en particulier finies, c'est-à-dire avec un nombre fini d'éléments) telles que groupes, anneaux, corps. Nous avons essayé de redonner l'essentiel de ce qui est nécessaire au début. Un traitement plus complet est à rechercher dans
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