| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and system for realizing a public key cryptosystem in pseudo manner at low costs. SOLUTION: Using a private key cryptosystem and a hardware with tamper resistance, a public key cryptosystem is realized in pseudo manner at low costs. Each user carries out communication by using equipment equipped with a hardware respectively having the same function mentioned later. That is, assignment of a key with some ID is provided and ID is made to be effective and stored by a request from a user, and decrypting and generation of MAC (message authenticator) are carried out with the key assigned to the ID. Though encrypting and inspection of MAC using an optional ID can be carried out, decrypting and generation of MAC cannot be carried out. The user keeps the ID open. A transmitter of a message encrypts the message by using the opened ID of the receiver of the message and using a hardware having the same function. Though a third party cannot carry out decrypting using the ID excepting for analyzing mechanism in the hardware, the hardware destroys itself to such a behavior. COPYRIGHT: (C)2006,JPO&NCIPI
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