AUTHENTICATING METHOD USING SECRECY DISPERSING METHOD

摘要

PROBLEM TO BE SOLVED: To enable authentication by an authentication system which uses a secrecy dispersing method without showing secrecy. SOLUTION: A secrecy generating person secretly gives a secret key to a main contractor and subordinate contractors selected by the main contractor. When it is certified that the secret key of the main contactor can be generated on the basis of a set of secret keys of some subordinate contractor, the set is authenticated. Since the authentication can be carried out without showing the secrecy of the main contactor, this system is reusable.