Code authentication upon bootup for cable modems

Details Code authentication upon bootup for cable modems Code authentication upon bootup for cable modems

2005-01-07

2008-11-18

Peeso, Thomas R (Department: 2132)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S166000, C713S182000

Reexamination Certificate

active

07454616

ABSTRACT:
An exemplary embodiment of a method (10) for authenticating software in a cable modem makes use of a secure key and certificate stored in flash memory. In this exemplary embodiment, the code employs a key to validate (16) a signature that is generated for each new build of the code. During build of the code, the code is digitally signed (12) using e.g., a Motorola RSA private key. The message digest and the signature are then stored at the end of code file itself (13). Each time the modem (52) reboots, the code can validate (16) that the image in flash has not been modified. This validation function (16) can be accomplished e.g., by calling an RSA Signature Verification function to confirm that the signature in the header equals the message digest signed by the manufacturer's private key or the manufacturer's CVC.

REFERENCES:
patent: 5491750 (1996-02-01), Bellare et al.
patent: 5752041 (1998-05-01), Fosdick
patent: 5815574 (1998-09-01), Fortinsky

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