double substitution cipher

См. также в других словарях:

• Substitution cipher — In cryptography, a substitution cipher is a method of encryption by which units of plaintext are replaced with ciphertext according to a regular system; the units may be single letters (the most common), pairs of letters, triplets of letters,… …   Wikipedia

• double substitution — noun : double key cipher …   Useful english dictionary

• double-key cipher — noun : polyalphabetic substitution; especially : a Vigenère cipher with a key word mixed alphabet …   Useful english dictionary

• Double DES — Résumé Concepteur(s) Inconnu Première publication Aucunne Dérivé de DES Chiffrement(s) basé(s) sur cet algorithme Aucun Caractéristiques Taille(s) du bloc …   Wikipédia en Français

• Cipher Block Chaining — Mode d opération (cryptographie) En cryptographie, un mode d opération est la manière de traiter les blocs de texte clairs et chiffrés au sein d un algorithme de chiffrement par bloc. Chacun des modes possède ses propres atouts. Plusieurs modes… …   Wikipédia en Français

• Transposition cipher — In cryptography, a transposition cipher is a method of encryption by which the positions held by units of plaintext (which are commonly characters or groups of characters) are shifted according to a regular system, so that the ciphertext… …   Wikipedia

• Playfair cipher — The Playfair cipher or Playfair square is a manual symmetric encryption technique and was the first literal digraph substitution cipher. The scheme was invented in 1854 by Charles Wheatstone, but bears the name of Lord Playfair who promoted the… …   Wikipedia

• Classical cipher — A cipher is a means of concealing a message, where letters of the message are substituted or transposed for other letters, letter pairs, and sometimes for many letters. In cryptography, a classical cipher is a type of cipher that was used… …   Wikipedia

• National Cipher Challenge — The National Cipher Challenge is an annual cryptographic competition organised by the University of Southampton School of Mathematics. Competitors attempt to break cryptograms published on the competition website. In the 2007/08 challenge, 1301… …   Wikipedia

• Four-square cipher — The Four square cipher is a manual symmetric encryption technique. It was invented by famous French cryptographer Felix Delastelle.The technique encrypts pairs of letters ( digraphs ), and thus falls into a category of ciphers known as… …   Wikipedia

• CS-Cipher — Résumé Concepteur(s) Jacques Stern et Serge Vaudenay Première publication 1998 Dérivé de SAFER Chiffrement(s) basé(s) sur cet algorithme …   Wikipédia en Français