METHOD AND SYSTEM FOR RECOVERING VALIDITY OF CRYPTOGRAPHICALLY SIGNED DIGITAL DATA

摘要

PROBLEM TO BE SOLVED: To provide techniques including a method and a system for recovering and/or validating data and/or associated signature log entries. SOLUTION: In the method for validating a restored message having an entry generated in a signature log for a message, where the entry includes cryptographic information associated with the message. When the message is lost, the restored message is generated in response to a request and the restored message is validated by using the signature log. In another embodiment, a method for validating a selected log entry by using a signature log having a plurality of recorded log entries is provided. The method includes a step for computing a cryptographic value for the selected log entry and a step for determining whether the cryptographic value is part of another recorded log entry or not.