COMMUNICATION TERMINAL EQUIPMENT VERIFICATION DEVICE

摘要

PURPOSE:To secure the confidentiality of a secret key by devising the verification equipment such that decoding of the secret key by an intercept party is more difficult. CONSTITUTION:A base key storage section 11a and a mobile key storage section 31a store plural kinds of secret keys corresponding to plural kinds of key indices for each mobile terminal equipment station. An arithmetic unit 11d calculates an inner produce between a secret key and a random number string to obtain a 1st authenticator, a comparator 11g compares the 1st authenticator with a 2nd authenticator to provide a prescribed enable signal, a base communication section 12 sends a random number string and a key index and receives the 2nd authenticator. A mobile communication section 23 receives the random number string and the key index and sends the 2nd authenticator and the arithmetic unit 31d extracts the secret key corresponding to the key index received from the base communication section 12 from the mobile key storage section and calculates an inner product between the secret key and the received random number string to obtain the 2nd authenticator.