CONDITIONAL ACCESS SYSTEM AND METHOD FOR PROVIDING SOURCE AUTHENTICATION AND NON-REPUDIATION

摘要

PURPOSE: A system and a method for restricting a receiving capable of providing source authentication and non-repudiation are provided to seclude attack from malicious attackers. CONSTITUTION: A CW is generated using pseudo random number generator from the number of b bit consisting of 0 and 1(S130). A server obtains Y value from a EAK(CW) which is the CW encrypted with AK(S131). A M value from a Ecw(contents) which is generated by encoding message with the CW(S132). Q value is obtained by performing(CW-1mod (N)) multiplying about H(contents) and modulo operation with N(S133).