GENERATION AND RECOVERY METHOD OF DISK SECRET KEY, AND SECRET INFORMATION MANAGEMENT SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a secret information management system capable of limiting a secret key to be recovered when a storage medium having a calculation function is lost without disclosing a secret key to a manager (third organization). SOLUTION: There are used a third organization STTP, IC card ICC, and a user PC. The third organization STTP stores first key generation auxiliary information Raibi(mode ni) and user identifier information Rdi(mod ni). When the IC card ICC is not connected, a virtual calculator monitor VMM of a user calculator PC recovers a disk secret key ski=Raibih(pwi)di(mod ni) based on: third recovery auxiliary information (Rdi)aibi(mod ni) obtained by sending second recovery auxiliary information (aibi)e(mod n) to the third organization; a hash value h of a password; and random number ri. COPYRIGHT: (C)2009,JPO&INPIT