Method for securing software updates

Details Method for securing software updates Method for securing software updates

2003-11-26

2008-10-21

Moazzami, Nasser (Department: 2136)

Cryptography

Communication system using cryptography

Symmetric key cryptography

C380S282000, C380S285000

Reexamination Certificate

active

07440571

ABSTRACT:
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.

REFERENCES:
patent: 6952823 (2005-10-01), Kryloff et al.
patent: 7120251 (2006-10-01), Kawada et al.
patent: 7174017 (2007-02-01), Bantz et al.
patent: 2002/0029347 (2002-03-01), Edelman
patent: 2003/0196096 (2003-10-01), Sutton
patent: WO 98/43431 (1998-10-01), None
patent: WO 01/35670 (2001-05-01), None

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