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METHOD FOR KEY DIVERSIFICATION ON AN IC CARD

  • US 20080008315A1
  • Filed: 06/29/2007
  • Published: 01/10/2008
  • Est. Priority Date: 06/29/2006
  • Status: Active Grant
First Claim
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1. Method for generating a key diversification during a mutual authentication between a master IC Card (1), storing a master key (KM), and a User IC Card (2) associated to an identification number (ICC.SN), said User IC Card (2) being connected to said master IC Card (1) through a communication interface (ITF), the method comprising the steps of:

  • deriving at least a couple of sub keys (KMa, KMb) from said master key (KM);

    computing at least a couple of ciphered strings (A, B) through corresponding cryptographic computations on a string (T) with said sub keys (KMa, KMb), said string (T) obtained by an elaboration on said identification number (ICC.SN);

    building a diversification key (KICC) concatenating a combination of bytes of said ciphered strings (A, B).

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