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METHOD OF GENERATING MESSAGE AUTHENTICATION CODE USING STREAM CIPHER AND AUTHENTICATION/ENCRYPTION AND AUTHENTICATION/DECRYPTION METHODS USING STREAM CIPHER

  • US 20080112561A1
  • Filed: 11/12/2007
  • Published: 05/15/2008
  • Est. Priority Date: 11/13/2006
  • Status: Active Grant
First Claim
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1. A method of generating a Message Authentication Code (MAC) using a stream cipher, comprising the steps of:

  • (a) dividing an input message M into k n-bit message blocks;

    (b) encrypting the respective divided input message blocks using a result obtained by exclusive-ORing (XORing) a secret key KMAC for MAC generation with a number among the number k of the message blocks divided in step (a), as a key, and calculating respective intermediate values;

    (c) XORing the respective intermediate values resulting from step (b); and

    (d) encrypting, at a key stream generator, the result of step (c) using the secret key KMAC for MAC generation and generating a MAC.

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