| 摘要 |
PROBLEM TO BE SOLVED: To suppress the increase of the size of data to be transferred in hierarchization by hierarchically transferring authentication information from secondary information to third order and fourth order information. SOLUTION: This authentication system is configured to generate Digest<SB>x</SB>(x is 1, 2 and so on) by a hash arithmetic operation based on a hash function value k_auth1 with key included in SI generated from PI, and inputs electronic ticket information and validity term information, and generates a hash function value k_auth<SB>x+1</SB>with key by using Digest<SB>x</SB>as a key. The Digest<SB>x</SB>, k_auth<SB>x</SB>, electronic ticket information and validity term information are transferred as temporary authentication information. COPYRIGHT: (C)2007,JPO&INPIT |
