Patent ID: 6018581
Filing Date: 2000-01-25
Classification: H04L

Abstract:
A communication system comprising a communication apparatus and a terminal for allowing a secure communication of data therebetween, wherein said communication apparatus and said terminal each hold a common secret key, and wherein:said communication apparatus comprises:a first random number generating unit for generating a first random number;an encryption/decryption key preparing unit for preparing an encryption/decryption key on the basis of the first random number generated by said first random number generating unit of said communication apparatus, a second random number generated by a second random number generating unit of said terminal, and the common secret key; andan encryption/decryption processing unit for encrypting or decrypting the data communicated between said communication apparatus and said terminal by using the encryption/decryption key; andsaid terminal comprises:said second random number generating unit for generating the second random number;an encryption/decryption key preparing unit for preparing the encryption/decryption key on the basis of the first random number generated by said first random number generating unit of said communication apparatus, the second random number generated by said second random number generating unit of said terminal, and the common secret key; andan encryption/decryption processing unit for encrypting or decrypting the data communicated between said communication apparatus and said terminal by using the encryption/decryption key.