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Antivirus accelerator for computer networks

  • US 6,094,731 A
  • Filed: 11/09/1998
  • Issued: 07/25/2000
  • Est. Priority Date: 11/24/1997
  • Status: Expired due to Term
First Claim
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1. A computer-based method for examining a file that is transmitted over a computer network from an originating computer to a recipient computer to determine whether a computer virus is present within said file, said file containing at least one sector, the method comprising the steps of:

  • causing the originating computer to;

    scan the file by an associated antivirus module while storing into a first storage area an identification of each file sector that is scanned and a hash value of each sector that is scanned; and

    calculate a digital signature of a computed message digest of contents of the first storage area; and

    causing the recipient computer to;

    compute a hash value for each file sector that was scanned by the originating computer, to generate a computed hash value;

    compare each computed hash value with the hash value stored within said first storage area for the corresponding sector, wherein, when any computed hash value fails to match a corresponding stored hash value for any sector, the entire file is rescanned;

    examine the authenticity of the digital signature by comparing a decrypted message digest with the computed message digest; and

    rescan the entire file when the decrypted message digest does not match the computed message digest.

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