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Understanding the DSSHA1 Synthesizable SHA-1 Coprocessor

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Abstract: Challenge-and-response authentication requires a MAC originator and a MAC recipient to compute a messageauthentication code based on a hidden secret and public data. The originator is typically a SHA-1 authenticator or a protectedmemory with SHA-1 engine. The MAC recipient is the application’s host processor. This application note describes theDSSHA1 synthesizable SHA-1 coprocessor, which can be implemented in an application-specific integrated circuit (ASIC) orfield-programmable gate array (FPGA) as alternative to the DS2460 SHA-1 coprocessor or a microprocessor-basedimplementation.
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