| 摘要 |
An encryption code and at least one key ale provided to a secure transmission de vice, via an external keying device, and stored in a volatile memory. A user code, ent ered via a keypad by a user, is received by the secure transmission device. An representation of the at least one key, based on the encryption code and the at least one key, is generated and stored in a non-volatile memory. Also, an encrypted repres entation of the encryption code and the user code, based on the user code, are generated and stored in the non-volatile memory. Upon power down of the secure transmission device, t he at least one key and encryption code stored in the volatile memory are erased. |
