Patent ID: 7739506
Filing Date: 2010-06-15
Classification: G06F,H04L

Abstract:
1. A removable authentication apparatus connected to an external apparatus, comprising inputting means for inputting the information for authentication; authentication means for authenticating said information for authentication, entered by said inputting means; a CPU (central processing unit) formed in an integrated circuit for comprehensively controlling an inner bus and said authentication means; PKI processing means for generating a secret key and a public key based on a PKI (Public Key Infrastructure) system for performing predetermined security processing with the secret key generated; storage means having a write-only area in which the secret key generated by said PKI processing means is written and which cannot be read out from outside, writing in said write only area being possible only by a write operation by said CPU; secret key transmitting means for directly accessing said write only area of said storage means, responsive to authentication of said information for authentication, by said authentication means, and for transmitting said secret key written in said write only area only between said PKI processing means and said storage means; and encrypted data generating means for encrypting data supplied from said external device by a DES (Data Encryption Standard) system key generated in accordance with the DES system to generate encrypted data; said PKI processing means encrypting said DES key to generate encrypted key data, using said secret key transmitted by said secret key transmitting means, by way of performing said predetermined security processing.