Method of messaging in a communication system
First Claim
1. In a communication system having a subscriber unit and an infrastructure communication center, a method of producing a secure key comprising the steps of:
- a) generating, by the subscriber unit, a first portion of a secure key as a function of a random process;
b) generating a second portion of the secure key based on the first portion; and
c) coupling the second portion to the first portion to produce the secure key.
4 Assignments
0 Petitions
Accused Products
Abstract
A communication system (100) employs a method of messaging between a subscriber unit (105) and an infrastructure communication center (101). A messaging key associated with a subscriber unit reference number is provided (203, 403) to the subscriber unit (105) and to the infrastructure communication center (101). An authentication key and/or an identifier for the subscriber unit (105) is then produced (300, 407) by either the subscriber unit (105) or the infrastructure communication center (101). The authentication key and/or the identifier is encrypted (207, 413) with the messaging key and is subsequently communicated (209, 415) between the subscriber unit (105) and the infrastructure communication center (101).
95 Citations
25 Claims
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1. In a communication system having a subscriber unit and an infrastructure communication center, a method of producing a secure key comprising the steps of:
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a) generating, by the subscriber unit, a first portion of a secure key as a function of a random process; b) generating a second portion of the secure key based on the first portion; and c) coupling the second portion to the first portion to produce the secure key. - View Dependent Claims (2, 3, 4, 5)
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6. A method of messaging in a communication system having a subscriber unit and an infrastructure communication center, the method comprising the steps of:
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a) providing a messaging key associated with a subscriber unit reference number to the subscriber unit and to the infrastructure communication center; b) producing an authentication key for the subscriber unit at the infrastructure communication center; c) encrypting the authentication key with the messaging key at the infrastructure communication center to produce an encrypted authentication key; and d) communicating the encrypted authentication key to the subscriber unit identified by the subscriber unit reference number. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of messaging in a communication system having a subscriber unit and an infrastructure communication center, the method comprising the steps of:
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a) providing a messaging key associated with a subscriber unit reference number to the subscriber unit and to the infrastructure communication center; b) producing an identifier for the subscriber unit at the infrastructure communication center; c) encrypting the identifier with the messaging key at the infrastructure communication center to produce an encrypted identifier; and d) communicating the encrypted identifier to the subscriber unit identified by the subscriber unit reference number. - View Dependent Claims (17, 18, 19, 20)
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21. A method of messaging in a communication system having a subscriber unit and an infrastructure communication center, the method comprising the steps of:
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a) providing a messaging key associated with a subscriber unit reference number to the subscriber unit and to the infrastructure communication center; b) generating an authentication key at the subscriber unit; c) encrypting the authentication key with the messaging key at the subscriber unit to produce an encrypted authentication key; and d) communicating the encrypted authentication key and the subscriber unit reference number to the infrastructure communication center. - View Dependent Claims (22, 23, 24, 25)
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Specification