Method of generating a stream cipher using multiple keys

Details Method of generating a stream cipher using multiple keys Method of generating a stream cipher using multiple keys

H - Electricity

04

L

H04L 9/22 (2006.01)

Patent

CA 2505338

In symmetric methods of encryption the stream cipher should be as long as the plaintext message. Such a cipher is difficult to generate if the plaintext data to be encrypted is enormous. The present invention provides a method of generating a stream cipher of variable length which may be extremely long. It is generated by creating a number of random sub-keys having non-repeating lengths and combining such sub-keys in a random way.

Dans les procédés de chiffrement symétriques, le chiffre continu devrait avoir une longueur égale à celle du message en clair. Il est difficile de générer un tel chiffre si le volume de données en texte clair à chiffrer est considérable. La présente invention a trait à un procédé permettant de générer un chiffre continu de longueur variable, laquelle peut être extrêmement importante. Le procédé consiste à créer un nombre de sous-clés aléatoires possédant des longueurs non répétitives, et à combiner de tels sous-clés de façon aléatoire.

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