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Method of cryptographing wireless data and apparatus using the method

  • US 7,539,866 B2
  • Filed: 05/20/2003
  • Issued: 05/26/2009
  • Est. Priority Date: 10/11/2002
  • Status: Active Grant
First Claim
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1. A system comprising:

  • a wireless LAN terminal coupled to an access point device, the wireless LAN terminal and access point device operate to exchange a key descriptor, the key descriptor having a structure comprising;

    a key initial vector which is a random number generated in the access point device;

    a key descriptor type which indicates an encryption algorithm; and

    a plurality of key materials encrypted according to the encryption algorithm of the key descriptor using the key initial vector and a master session key shared between the wireless LAN terminal and the access point device, a first encrypted key material to enable formation of a first encryption key,wherein a second wireless session encryption key that is formed by the wireless LAN terminal from a second encrypted material of the plurality of encrypted key materials after the first encrypted key material operates as a new encryption key that is different from the first encryption key for re-keying wireless LAN terminal encryption, andwherein each of the key materials comprises;

    a tag part which designates a wireless section encryption algorithm;

    a length part which designates the length of a wireless section encryption key; and

    a key value part which represents the wireless section encryption key.

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