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Software alone cannot satisfy all smart card requirements. Manufacturers must offer additional functions in hardware. The authors describe true random-number generators and an Advanced Encryption Standard computation unit; two different special-purpose hardware blocks that can be integrated on the silicon substrate along with the usual functional units of a smart card microcontroller.
Raimondo Luzzi, Domenico De Seta, Marco Bucci, Elena Trichina, "Supplemental Cryptographic Hardware for Smart Cards", IEEE Micro, vol. 21, no. , pp. 26-35, November/December 2001, doi:10.1109/40.977755
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