Stmicroelectronics (Rousset) Sas

Thomas Sarno

Yanis Linge

Guillaume Reymond

A cryptographic device includes hardware data processing circuitry and software data processing circuitry coupled to the hardware data processing circuitry. The device, in operation, executes a plurality of rounds of a symmetrical data cipher algorithm and protects the execution of the plurality of rounds of the symmetrical data cipher algorithm. The protecting includes executing data masking and unmasking operations using the hardware data processing circuitry, executing linear operations applied to data using the software data processing circuitry, executing linear operations applied to masks using the hardware data processing circuitry, and executing non-linear operations applied to data using one of the hardware data processing circuitry or the software data processing circuitry.

Protection of a cipher algorithm

Systems and methods for protecting secret or secure information involved in generation of ciphered data by circuitry. The circuitry includes data paths and key paths that operate to perform cipher operations to generate a plurality of key shares and a plurality of data shares using a key and data as input. The data and the key may be masked by at least one mask. The plurality of key shares may be generated using the key and a first mask. The plurality of data shares are generated using key shares, the data, and a second mask.

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Fuveau, France

Thomas Sarno