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System and method for protecting integrity of alterable ROM using digital signatures

  • US 5,802,592 A
  • Filed: 05/31/1996
  • Issued: 09/01/1998
  • Est. Priority Date: 05/31/1996
  • Status: Expired due to Term
First Claim
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1. A system, comprising:

  • a processor;

    a storage device storing an operating system program for execution on the processor;

    an alterable read only memory for storing data; and

    a corruption detection device for detecting unauthorized changes to data in the alterable read only memory, the corruption detection device reading a signature, encrypted with a private key, that represents a non-corrupted version of data in the alterable read only memory, and further reading, from a secure memory location, a public key for decrypting the signature, the corruption detection device operating to compare the decrypted using public key, signature to a computed signature for detecting an occurrence of an unauthorized change to the data in the alterable read only memory.

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