AUTHENTICATION PROCESSING DEVICE AND SECURITY PROCESSING METHOD

An authentication processing device executes a security processing based on the PKI according to an authentication result of information which is input to be authenticated. The device includes an input section (12) for inputting information to be authenticated, an authentication processing section (21) for performing authentication processing of the information input from the input section to be authenticated, a PKI processing section (23) for creating a secret key and a public key according to the PKI (Public Key Infrastructure) method and executing a predetermined security processing by using the secret key created, a storage section (24) having a write-dedicated region into which the secret key created by the PKI processing section (23) is written and from which read from outside is impossible, and a secret key transfer section (25) for directly accessing the write- dedicated region of the storage section (24) and transferring the written secret key to the PKI processing section (23) when the information to be authenticated is successfully authenticated by the authentication processing section (21).