Differential power analysis resistant encryption and decryption functions
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United States of America Patent
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Jun 11, 2019
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N/A
app pub date -
Apr 26, 2016
filing date -
Apr 29, 2011
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Abstract
Circuits, methods, and systems are provided for securing an integrated circuit device against Differential Power Analysis (DPA) attacks. Plaintext (e.g., configuration data for a programmable device) may be encrypted in an encryption system using a cryptographic algorithm. Ciphertext may be decrypted in a decryption system using the cryptographic algorithm. The encryption and/or decryption systems may obfuscate the plaintext, the ciphertext, and/or the substitution tables used by the cryptographic algorithm. The encryption and/or decryption systems may also generate cryptographic key schedules by using different keys for encrypting/decrypting different blocks and/or by expanding round keys between encryption/decryption blocks. These techniques may help mitigate or altogether eliminate the vulnerability of cryptographic elements revealing power consumption information to learn the value of secret information, e.g., through DPA.
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