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).
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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