Key protection mechanism

Details Key protection mechanism Key protection mechanism

2006-12-22

2010-10-26

LaForgia, Christian (Department: 2439)

Cryptography

Key management

C380S028000, C380S029000, C380S037000, C380S044000, C380S047000, C380S259000, C380S262000, C713S159000, C713S165000, C713S171000, C713S182000, C713S192000, C713S193000, C713S194000, C726S002000, C726S022000, C726S023000, C726S024000, C726S026000, C726S034000, C726S035000, C726S036000

Reexamination Certificate

active

07822207

ABSTRACT:
A method of protecting secret key integrity in a hardware cryptographic system includes first obtaining an encryption result and corresponding checksum of known data using the secret key, saving those results, then masking the secret key and storing the masked key. When the masked key is to be used in a cryptographic application, the method checks key integrity against fault attacks by decrypting the prior encryption results using the masked key. If upon comparison, the decryption result equals valid data, then the key's use in the cryptographic system can proceed. Otherwise, all data relating to the masked key is wiped from the system and fault injection is flagged.

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