A method of protecting a cryptosystem from a multiple...

H - Electricity – 04 – L

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H04L 9/30 (2006.01)

Patent

CA 2413381

A method of protecting a cryptosystem from a multiple transmission attack (202, 203), comprises: a) applying to a plaintext message P to be encrypted to a protective cipher having a cipher keyk, to produce a protected message (S(K)XOR P); b) creating from the protected message and the cipher key k an encryption input message (K|(S(K)XOR P); and c) encrypting the message. The invention find particular although not exclusive application within public key cryptosystems. The invention, when used in association with a strong standard cipher, protects against multiple transmission attack MTA by ensuring that the text which is encrypted differs every time a message is sent, even if identical messages are sent multiple times.

L'invention concerne un procédé permettant de protéger un système cryptographique contre une attaque (202, 203) par saturation d'émissions, qui consiste a) à appliquer à un message clair à crypter P un algorithme cryptographique protecteur possédant une clé de chiffrement <i>k</i> afin de produire un message protégé (S(K)XOR P); b) à créer à partir du message protégé et de la clé de chiffrement <i>k</i> un message d'entrée de cryptage (K//(S(K)XOR P); et c) à crypter ledit message. L'invention trouve une application particulière mais non exclusive dans les systèmes cryptographiques à clé publique. Lorsqu'on l'utilise en association avec un standard de chiffrement incassable, cette invention protège contre une attaque par saturation d'émissions, le texte crypté différant chaque fois d'un message envoyé même lorsque des message identiques sont envoyés plusieurs fois

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