The TrustNo 1 Cryptoprocessor Concept
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The concept of a bus-encryption microprocessor that . thetical "TrustNo 1 " security microprocessor design. . software protection concept that has been .
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Abstract: Cryptoprocessors feature an on-chip blockcipher hardware between the cache and the bus inter-face. Code and data are decrypted on-the-fly while be-ing fetched from RAM and are encrypted while beingwritten into RAM. Even someone with full physicalaccess to the printed circuit board cannot observe theexecuted cleartext software and its data structures.Cryptoprocessors have been used for many years asmicrocontrollers in security sensitive applications likefinancial transaction terminals. This paper exploresthe hardware, firmware, operating system, and keymanagement mechanisms necessary in order to applythe cryptoprocessor concept in multitasking operatingsystem workstations.
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