Patent ID: 6058476
Filing Date: 2000-05-02
Classification: H04L

Abstract:
An encryption apparatus for devices which perform a challenge/response-type authentication of a device in communication, distribute a data transfer key to the device in communication and use the data transfer key to perform encrypted communication with the device in communication, the encryption apparatus comprising:first random number generation means for generating first random number for distributing the data transfer key;first random number storage means for storing the generated first random number;first transmission means for incorporating the generated first random number into either challenge data or response data and transmitting either the challenge data or response data with the first random number to a device in communication, the challenge data being used to authenticate the device in communication and the response data being used to certify legitimacy of the encryption apparatus itself,wherein the device in communication is another device in current encrypted communication;data transfer key generation means for generating the data transfer key through use of the first random number stored by the first random number R1 storage means, the data transfer key being time-varying;transfer data encryption means for encrypting the transfer data to be transferred in the encrypted communication through use of the data transfer key,wherein the first random number generation means, the first random number storage means, the data transfer key generation means, and the transfer data encryption means are implemented through a single IC chip, andwherein the first random number storage means stores the first random number in an area tamper-proof from outside the single IC chip.