| 摘要 |
An encryption key processing system includes a user terminal system which uses a key and a sub-system for holding information regarding the user terminal system, the sub-system generating predetermined public information, secret information corresponding to the public information and a secret key dependent on an identifier of said user terminal system, sending a secret key to the user terminal system in secret and the user terminal system generating and using a key and necessary information based on a secret key and public information received from the sub-system.
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