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Method and device for authenticating digital data by means of an authentication extension module

  • US 20050125659A1
  • Filed: 06/25/2004
  • Published: 06/09/2005
  • Est. Priority Date: 07/02/2003
  • Status: Active Grant
First Claim
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1. A method of authenticating digital data distributed between a plurality of data segments linked to each other in accordance with a chosen chaining relationship, each data segment being associated with an authentication signature, which method comprises the following steps:

  • authenticating said plurality of segments in accordance with a chosen authentication algorithm, adapted to calculate a signature value for each successive segment in a chained and iterative manner and to compare the value of said signature calculated in this way with said associated signature, the next segment being authenticated in said event of a positive result on comparing said current segment and said first segment being authenticated on the basis of at least one function from an authentication library contained in non-rewritable memory, providing at least one segment forming an executable authentication plug-in previously authenticated by at least one authentication function from said authentication library and linked to said plurality of segments in accordance with said chaining relationship, and in response to a request for authentication of a plurality of segments chained in accordance with said chaining relationship in this way, authenticating each successive segment and, in the case of a segment requiring said authentication plug-in, executing said authentication plug-in in order to authenticate said segment submitted in this way to said authentication plug-in.

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