摘要:
A microprocessor including a memory and a central processing unit configured to sign a binary word written in the memory, and during the reading of a binary word in the memory, verify the signature of the binary word and, if the signature is invalid, launching a protective action of the memory. According to the invention, the central processing unit is configured to execute a write instruction of a binary word accompanied by an invalid signature in a memory zone, so that a later read of the memory zone by the central processing unit launches the protective action.
摘要:
A method and a device protected against hidden channel attacks includes a calculation of the result of the exponentiation of a data m by an exponent d. The method and the device are configured to execute only multiplications of identical large variables, by breaking down any multiplication of different large variables x, y into a combination of multiplications of identical large variables.
摘要:
A countermeasure method in an electronic component implementing an asymmetric private key encryption algorithm includes generating a protection parameter, calculating, using a primitive, an intermediate data from the protection parameter, dividing the binary representation of the private key into several binary blocks, transforming each binary block using the protection parameter and, for each transformed binary block, performing an intermediate calculation using the primitive, and calculating an output data by combining the intermediate data with the intermediate calculations.
摘要:
An integrated circuit includes a communication interface circuit, a cryptographic algorithm, a countermeasure configured to protect the cryptographic algorithm against side-channel attacks, and a mask generator configured to provide the countermeasure with mask values. The integrated circuit is configured to execute a specific command requiring the disclosure of mask values used by the countermeasures to protect the cryptographic algorithm during a cryptographic session, and, in response to such a command, to send the mask values through the communication interface circuit.