| 摘要 |
An object of the present invention is to provide an encryption/decryption system and encryption/decryption equipment which suppress the adverse effect of a load on arithmetic and logic operations to be performed by a computer, whose cipher system is hard to infer, which provide great security, and which eliminate the labor of managing keys or entering a key. A security key that encrypts or decrypts data using random numbers generated by a thermal noise random number generator is detachably attached to a personal computer. When attached to the personal computer, the security key autonomously encrypts or decrypts data to be handled by the personal computer. In other words, encryption/decryption equipment employing the thermal noise random number generator is detachably attached to a computer. The encryption/decryption equipment can be used as easily as keystrokes are made, and great security can be guaranteed.
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