METHODS TO PROVIDE DIGITAL SIGNATURE TO SECURE FLASH PROGRAMMING FUNCTION
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United States of America Patent
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Issued Date -
May 2, 2013
app pub date -
Jul 24, 2012
filing date -
Oct 28, 2011
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for providing digital signatures for authenticating the source and content of binary files which are flash programmed into automotive embedded controllers. A piece of electronic content is digitally signed on a signing server by creating a hash value and encrypting it using the signer's private key. The content file and digital signature files are then delivered using one of several alternative approaches to a programming tool, which in turn loads the content and signature files onto the controller on which the content will execute. The controller verifies the content by decrypting the signature file to restore the hash value, and comparing the decrypted hash value to a hash value calculated from the content itself. Multiple signature files for a piece of content are supported.
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