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Method and apparatus for securing data stored in semiconductor memory cells

  • US 5,644,636 A
  • Filed: 12/30/1994
  • Issued: 07/01/1997
  • Est. Priority Date: 12/30/1994
  • Status: Expired due to Term
First Claim
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1. A method for securing data in a semiconductor memory cell of a semiconductor memory device, comprising the steps of:

  • programming data in the memory cell by applying a voltage which causes charges to be trapped in the memory cell;

    making a measurement of the level of trapped charges in the memory cell after the memory cell is programmed;

    generating a numerical representation of the level of trapped charges as a reference fingerprint of the memory cell; and

    storing the numerical representation.

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