Symmetric cryptographic system for data encryption

Details Symmetric cryptographic system for data encryption Symmetric cryptographic system for data encryption

H - Electricity

04

L

H04L 9/28 (2006.01) H04L 9/06 (2006.01)

Patent

CA 2134410

A novel symmetric cryptographic system for data encryption using novel partially bent-function-based (m x n) substitution boxes (s- boxes), where m and n are positive even numbers, mn and m<log Image is disclosed. A novel key schedule is used for selecting internal keys which also undergo substitution transformation by s-boxes. The s- boxes are designed on the principle that bent-function-based s-boxes possess good characteristics for encryption. The s-boxes of the invention are represented by (m x n) binary matrices.

Nouveau système cryptographique symétrique pour le chiffrement de données au moyen de nouvelles boîtes de substitution basées sur une fonction de courbure partielle (m x n), m et n étant des nombres positifs pairs, m~n et m<log Image . Une nouvelle table de clés est utilisée pour la sélection de clés internes qui font également l'objet d'une transformation de substitution au moyen des boîtes de substitution . Les boîtes de substitution sont conçues selon le principe que les boîtes de substitution basées sur une fonction de courbure partielle ont de bonnes caractéristiques de chiffrement. Les boîtes de substitution de l'invention sont représentées par des matrices binaires (m x n).

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