Schneider Electric Industries Sas

Stmicroelectronics (grenoble 2) Sas

Jean-Philippe Fassino

Roland Bohrer

Jean-Michel Brun

Laurent Gerard

A method provides a firmware update to an electronic device, to code signing for firmware updates of electronic devices, and a system therefor. In particular, the system and method for updates firmware that is authenticated through a public key infrastructure. The method includes an electronic device receiving a firmware update provided with a signature of a signing key, a signing certificate with a signature of a master key, and a revision number. The device verifies the signature of the master key on the signing certificate of the signing key, checks the revision number on the signing certificate of the signing key against a roll back counter, and verifies the signature of the signing key on the firmware update. The device then rejecting or accepting the received firmware update based on the outcome of the above verifying and checking.

Method for providing a firmware update of a device

A method for secure processing of encrypted data within a receiver includes receiving a packet of encrypted compressed data and allocating a region of memory for storing a decrypted version of the packet of encrypted compressed data. The allocation is in response to, and after, reception of the encrypted compressed data. A size of the region of the memory allocated is equal to a size of the packet of encrypted compressed data that is received. The method further includes modifying a configuration of an access authorization filter for defining access rights to the allocated region, decrypting the packet of encrypted compressed data, and storing, in the allocated region, the decrypted compressed data of the packet. The aforementioned allocation, modification, decryption, and storage steps are repeated in response to each new reception of a packet of encrypted compressed data so as to dynamically modify the configuration of the access authorization filter.

Growing community of inventors

Gresin, France

Jean-Philippe Fassino