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US 2004/0107349 A1Published application
Method for securing software updates
AssigneeNagravision S.A.
InventorsMarco Sasselli, Nicolas Pican
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AssigneeNagravision S.A.
InventorsMarco Sasselli, Nicolas Pican
Estimating the term…
This invention proposes a method for securing updating software in a plurality of decoders based on the generation of a signature by means of a private asymmetrical key. The updating of a decoder is carried out by downloading, from a managing center, a data block including a patch and its signature, said block is stored in a RAM. The signature is decrypted with a current public key from a list contained in a first non-volatile memory of the decoder, then verified and in the case of correspondence, a command leads the installation of the patch in a second non-volatile Flash memory and the deactivation of the current key. The aim of this invention is to considerably reduce the impact of the discovery of a private key by mean of a systematic analysis of the working of the decoder software, or to notably increase the time and the means necessary for the process used to determine said private key.
Method for securing updating data from a plurality of apparatuses, each apparatus receiving the updates from a managing center, these updates including data called patch accompanied by a control block encrypted by a private asymmetrical key taken from a list of keys included in the managing center, characterized by following steps:
Dependencies are inferred from the claim text.