Key digital identification method using once variable quantity

Key digital identification method using once variable quantity

  • CN 1,980,124 A
  • Filed: 12/05/2005
  • Published: 06/13/2007
  • Est. Priority Date: 12/05/2005
  • Status: Active Application
First Claim
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1. , a kind of key digital identification method is characterized in that:

  • Use once variable quantity when using key message to be authenticated by calculating and check message authentication code;

    Once variable quantity needs to preserve spendable variable and user mode thereof before use, the calculating of message authentication code must use once variable quantity to carry out computing with message, when authentication message, not only message authentication code to be verified, also once variable quantity and the user mode of using simultaneously thereof must be verified;

    After using once variable quantity, necessary mark and its user mode of preservation;

    For key and the verification function determined, once variable quantity only is used for effective authentication message once.

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