Encryption method, decryption method, encryption/decryption method, cryptographic communications system, and computer usable medium

   
   

An encryption/decryption method applicable to product-sum cryptosystem. This method enables highspeed decryption. A ciphertext C=m.sub.0 B.sub.0 +m.sub.1 B.sub.1 + . . . +m.sub.K-1 B.sub.K-1 is produced from a scalar product of a plaintext vector m=(m.sub.0, m.sub.1, . . . , m.sub.K-1) and a base vector B=(B.sub.0, B.sub.1, . . . , B.sub.K-1).

Une méthode d'encryption/decryption applicable au cryptosystem de produit-somme. Cette méthode permet le déchiffrage highspeed. Un texte chiffré C=m.sub.0 B.sub.0 +m.sub.1 B.sub.1 +. . . +m.sub.K-1 B.sub.K-1 est produit à partir d'un produit scalaire d'un vecteur m=(m.sub.0, m.sub.1 de plaintext. . . , m.sub.K-1) et un vecteur bas B=(B.sub.0, B.sub.1. . . , B.sub.K-1).

 
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