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Method for protecting a volatile file using a single hash

  • US 5,694,569 A
  • Filed: 06/05/1995
  • Issued: 12/02/1997
  • Est. Priority Date: 11/19/1993
  • Status: Expired due to Term
First Claim
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1. A method for protecting a collection of a plurality of discrete data units which are modified from time to time by an associated data processing system comprising the steps of:

  • obtaining an individual hash value for each of the discrete data units by performing a hash operation using at least the data value portion of the data unit which is to be protected; and

    aggregating said individual hash values into an aggregate hash value for said collection using a function which permits the independent inclusion and deletion of each individual hash value from the aggregate hash value.

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