Data verifying method apparatus for creating data to be verified and data verifying apparatus

摘要

A token 12 creates utilization history information and sends the information to an information processing unit 11 and simultaneously creates an verification value and stores the value in a utilization-value holding unit 21. The information processing unit 11 records the utilization history information in a history holding unit 16. On receiving a verification-value output request from the information processing unit 11, the token 12 provides the verification value with a signature and outputs the combination of the verification value and the signature. The information processing unit sends to a recovery unit 13 the verification value with the signature as well as the utilization history information. The recovery unit 13 verifies the signature and also the utilization history on the basis of the verification value further.