Abstract: A compact apparatus for generation of desired pseudorandom sequences with controllable period. The apparatus includes two-dimensional cellular automata for generating a first sequence, 2-by-L cellular automata for generating a second sequence, adders for performing bit-to-bit mod2 sum of the first sequences and the second sequences, and a buffer for buffering the resultant sequences from the adders.

Abstract: Disclosed herein is a device authentication system capable of authenticating devices efficiently using the common key system. When a CE device requests service offerings from a service server, the service server in turn requests the CE device to be authenticated by a device authentication server. Given the request, the CE device causes the device authentication server to perform device authentication on that device and transmits the result of the device authentication to the service server. Upon receipt of the device authentication result from the CE device, the service server causes the device authentication server to check that the authentication has been performed correctly and then starts offering services to the CE device. The CE device and device authentication server share a pass phrase, and each of the two parties checks that the other party indeed retains the pass phrase for mutual authentication.

Abstract: A compact apparatus for generation of desired pseudorandom sequences with controllable period. The apparatus includes two-dimensional cellular automata for generating a first sequence, 2-by-L cellular automata for generating a second sequence, adders for performing bit-to-bit mod2 sum of the first sequences and the second sequences, and a buffer for buffering the resultant sequences from the adders.

Abstract: Disclosed herein is a device authentication system capable of authenticating devices efficiently using the common key system. When a CE device requests service offerings from a service server, the service server in turn requests the CE device to be authenticated by a device authentication server. Given the request, the CE device causes the device authentication server to perform device authentication on that device and transmits the result of the device authentication to the service server. Upon receipt of the device authentication result from the CE device, the service server causes the device authentication server to check that the authentication has been performed correctly and then starts offering services to the CE device. The CE device and device authentication server share a pass phrase, and each of the two parties checks that the other party indeed retains the pass phrase for mutual authentication.

Abstract: Key encryption key data KEK used for communication between a key management device 3 and receiving apparatuses 4—1 to 4_N is acquired based on a tree divided into two horizontal layers A0 and A1. In this case, the LSD method is employed as a revocation method of each section 31[0] belonging to the horizontal layer A0. Further, the CST method is employed as the revocation method of each section 31[1] belonging to the horizontal layer A1.

Abstract: According to the configuration of the present invention, the modulation clock signal is generated in accordance with a signal based on a random number, and a data processing timing is determined in accordance with the modulation clock signal to execute data processing. Accordingly, secret information analysis of an encryption key, a decryption key and the like through measurements of consumption powers in terms of a lapse time of a cryptographic processing apparatus for encrypting and decrypting data, i.e., cryptanalysis based on the power analysis, can be made difficult to thereby realize a cryptographic processing apparatus and method having a high security level.