SECURITY SYSTEM WITH CERTIFICATE REVOCATION FUNCTION

摘要

PURPOSE: A security system with a certificate revocation function is provided to form a certificate revocation mechanism without an additional calculation process by using an elliptic curve cryptogram. CONSTITUTION: A secret key is calculated by selecting the first integer from a predetermined range and the secret key is set up as a user secret key(1,2). The second integer is obtained by using the secret key(3). The secret keys formed by the first and the second integers are transmitted to a security mediation portion and a user(4). The user discloses a public key(5). A cryptogram including the first and the second cryptograms is generated by using random numbers and the public key. The first cryptogram is transmitted to the security mediation portion to verify a user certificate. The security mediation portion verifies the first cryptogram. The first cryptogram is decoded if the security mediation portion verifies the first cryptogram.