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EP0011615A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Method and device for encryption and decryption of data.

Assignee: Individual
•
Filing: 1979-07-16
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Granted: —
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Expires: 1999-07-16
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Abstract

Abstract Translated from English Le chiffre et le chiffrage de l'information d'un message se font en divisant le texte en clair du message en blocs de bits et par une division supplementaire de ces blocs en sous-blocs qui sont consideres comme des elements d'un champ de Galois. Une matrice (M) en clair de ces elements est multipliee par une premiere matrice-cle (A) d'un groupe sur ce champ de Galois, le produit resultant (M-A) etant multiplie par une seconde matrice-cle (B) du meme groupe sur ce champ Galois. Le produit final (B-M-A) alors obtenu constitue le bloc du message chiffre. (K). Le chiffrage se fait en multipliant le produit transmis (B-M-A) par les matrices-cles inverses (A-1, B-1) generees par les memes cles (a, b) que celles utilisees pour le chiffrage et prises dans l'ordre convenable. The encryption and encryption of message information is done by dividing the clear text of the message into blocks of bits and further dividing those blocks into sub-blocks which are considered to be elements of a field. Galois. A matrix (M) in clear of these elements is multiplied by a first key matrix (A) of a group on this Galois field, the resulting product (MA) being multiplied by a second key matrix (B) of the same group on this Galois field. The final product (B-M-A) then obtained constitutes the block of the cipher message. (K). The encryption is done by multiplying the transmitted product (BMA) by the inverse key matrices (A-1, B-1) generated by the same keys (a, b) as those used for the encryption and taken in the correct order .

Inventors

  • 👤 Hugo Brandstrom

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 09:30
CPC Classifications
H; H04; H04L; H04L9/00; H04L9/06; H04L9/0618; H04L2209/00; H04L2209/12

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