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Method and apparatus for rapid secure session establishment on half-duplex AD-hoc group voice cellular network channels

  • US 20060281480A1
  • Filed: 05/18/2005
  • Published: 12/14/2006
  • Est. Priority Date: 05/18/2005
  • Status: Active Grant
First Claim
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1. A secure group communication method for a wireless dispatch system comprising a group of members, the group members comprising a first secure device which communicates with a plurality of second secure devices over a channel, comprising:

  • creating a group member list comprising the first secure device and the plurality of second secure devices;

    generating a group traffic encryption key at the first secure device;

    establishing, responsive to a first secure call request from the first secure device, a unique key encryption key at the first secure device for each of the plurality of second secure devices, wherein each unique key encryption key is generated via an asymmetric key exchange between the first secure device and each of the plurality of second secure devices during a first session, wherein each unique key encryption key has a corresponding unique private key which corresponds to the unique key encryption key for that particular second device;

    generating a unique state vector for each of the plurality of second secure devices at the first secure device, wherein the first secure device also has a first unique state vector, and wherein each unique state vector corresponds to a particular one of the plurality of second secure devices;

    sending the group member list, the unique state vectors and the group traffic encryption key to each of the plurality of second secure devices;

    storing the group traffic encryption key in the secure devices of the group members for use during a second session between the group members to expedite group traffic encryption key establishment during call set-up of the second session; and

    establishing, responsive to a second secure call request from the secure device of one of the group members, the second session between the group members by using the group traffic encryption key from the first session and the unique state vector of each of the secure devices to establish the second session during call set-up of the second session.

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