Stmicroelectronics (Grand Ouest) Sas

Stmicroelectronics (Alps) Sas

Stmicroelectronics (Grenoble 2) Sas

Franck Albesa

Nicolas Anquet

The present disclosure relates to a method for decrypting encrypted data. The method includes generating a first count value by a monotonic counter of a processing device, deriving, using a key derivation circuit, a first encryption key based on the first count value, transmitting the first encryption key to a cryptographic processor; and decrypting, based on the first encryption key, first encrypted data.

Method and device for secured deciphering of ciphering data

The present disclosure relates to a method for performing a cryptographic operation, the method including generating a first count value by a monotonic counter of a processing device, transmitting the first count value from the monotonic counter to a memory of the processing device, selecting a first encryption key from the memory based on the first count value, and providing the selected first encryption key to a cryptographic processor.

Secured storage of ciphering keys

A method includes protecting a boot sequence of a processing device by incrementing a counting value generated by a monotonic counter, then a first time period after the beginning of the boot sequence, comparing, by the protection circuit, the counting value with a first reference value, and, if the counting value is smaller than the first reference value, changing, by the protection circuit, the counting value to the first reference value.

Processing device and method for secured boot

The present disclosure relates to a method for booting a processing device, the method including: generating, by a monotonic counter and during a first boot phase, a first count value; transmitting, by the monotonic counter, the first count value to an access control circuit of a memory; reading, on the basis of the first count value, first data stored in the memory; and generating, by the monotonic counter and during a second boot phase, a second count value greater than the first count value. The access control circuit of the memory is configured so that the reading of the first data is not authorized on the basis of the second count value.

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Parigne l'eveque, France

Franck Albesa