Stmicroelectronics (rousset) Sas

Stmicroelectronics (grand Ouest) Sas

Julien Couvrand

William Orlando

Pierre Guillemin

The present description concerns an electronic system including one or a plurality of first microprocessors, a second microprocessor for securely managing first encryption keys of the first microprocessors, the second microprocessor being configured to communicate with each first microprocessor and including a first non-volatile memory having at least one second key stored therein, and for each first microprocessor, a second non-volatile memory external to the second microprocessor and containing the first keys of the first microprocessor encrypted with the second key.

Electronic system comprising a plurality of microprocessors

A method includes receiving, by a first microprocessor, a request of modification of a content of a first memory of the first microprocessor, the first memory being accessible only by the first microprocessor. The method includes accessing, by the first microprocessor, first data associated with the request and a signature generated from the first data with an asymmetric cipher algorithm. The first data and the signature are available in a second memory of a second microprocessor, and the first data is representative of a modification to be applied to the content of the first memory. The modification is representative of a modification of a set of services exposed by the first microprocessor. The method includes verifying, by the first microprocessor, authenticity of the first data based on the signature; and modifying the content of the first memory according to the first data, the modifying being conditioned by the verifying.

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Le Mans, France

Julien Couvrand