A cryptosystem for data security

H - Electricity – 04 – L

Patent

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H04L 9/00 (2006.01)

Patent

CA 2460863

A method and device for creating ciphertext from plaintext, and for decoding ciphertext, utilizing a tree structure for both encoding and decoding, the tree having leaves which are associated with plaintext symbols and the branches having assigned thereto a member of the ciphertext alphabet so that when encoding, a traversal is made between the root and the leaf corresponding to the plaintext and recording the ciphertext associated with each branch traversed, and when decoding, using the ciperhtext to determine the branches to be traversed until a leaf is reached and recording the plaintext associated with that leaf.

L'invention concerne un procédé et un dispositif pour créer un cryptogramme pour un texte en clair, ainsi que pour décoder un cryptogramme, en faisant appel à une structure arborescente à la fois pour le codage et le décodage. L'arborescence a des noeuds terminaux associés à des symboles du texte en clair et des branches auxquelles est alloué un élément de l'alphabet du cryptogramme de sorte que, lors du chiffrement, une traversée est effectuée entre la racine et le noeud terminal correspondant au texte en clair et enregistrant le cryptogramme associé à chaque branche traversée, et lors du déchiffrement, le cryptogramme sert à déterminer les branches à traverser pour atteindre un noeud terminal, le texte en clair associé à ce noeud terminal étant enregistré.

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