An attention is being given to the new system of distributing commodities for the core. It becomes possible to integrate some cores on a chip allowing free choice from the cores developed by various foundry in a quest of the core (mega-cell) standardization efforts. On such trends, virtual socket interface (VSI) alliance has been formed in 1996, and since then hopes run high that the new system of distributing commodities for the cores of large scale ASIC, including problems associated with the intellectual property (IP) of the cores, will be established in the not-too-distant future. In a VSI chip integrated from free choice of the cores developed by various foundry, we face much larger risks of the unauthorized duplication and usage. For this reason, a guarantee of the protected IP of cores should be offered.
In this paper, we propose a structure-protected IP of a core by public key cryptosystem focused as an information security techniques. The necessary structure of the multiplier/divider for the power residue arithmetic embedded in each cores is also essential for the arithmetic in what we call system LSI, so it won't be allowed to remove the arithmetic block and that assures a tight structure-protected IP of the core. Hardware only RSA encryption and its authentication system is also explained briefly.
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