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Recently, security on programs and data is strongly required in multitask open computer systems such as personal computers, mobile phones and IC cards. Several kinds of secure microprocessor architect...ures have been proposed to offer solutions to the problem. But these architectures are much inclined to general software protection. We focus on only secret data protection including its control code in a program. In this paper, we propose a processor architecture, which enables programmer to use special instruction set for control cryptography data and protect secret data from hostile software. It is called Cryptographic DataPath Processor( CDPP). This architecture lets not memorize secret data while decrypted even if in internal registers. Secret data is decrypted just in front of an ALU on datapath and encrypted just behind it. Programmers can control the cryptograph by special instructions activating symmetric cipher circuits. CDPP enables secure data control implementation by programmers under hostile software environments.show more
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