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.