EFFICIENT GENERATION METHOD OF AUTHORIZATION KEY FOR MOBILE COMMUNICATION
First Claim
1. A method of generating an authorization key corresponding to an authenticated subscriber station in a wireless communication system, the method comprising:
- acquiring at least one root key for generating the authorization key through an authentication procedure according to a authentication mode negotiated by a subscriber station and a base station;
determining an authorization key generation number; and
generating the authorization key on the basis of the root key and the authorization key generation number.
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Accused Products
Abstract
The present invention relates to a method of generating an authorization key for a wireless communication system. In the wireless communication system, when an authorization key is generated after authentication between a subscriber station and base station is successfully performed, the authorization key is generated using a value indicating the number of generation times of the authorization key. Subsequently, the subscriber station and the base station confirm through a predetermined procedure whether or not they share the same authorization key and the same number of generation times of the authorization key. According to such a method of generating an authorization key, an authentication function for messages to be transmitted and received between the subscriber station and the base station can be efficiently supported. Further, replay attacks by malignant users can be powerfully protected against.
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Citations
18 Claims
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1. A method of generating an authorization key corresponding to an authenticated subscriber station in a wireless communication system, the method comprising:
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acquiring at least one root key for generating the authorization key through an authentication procedure according to a authentication mode negotiated by a subscriber station and a base station; determining an authorization key generation number; and generating the authorization key on the basis of the root key and the authorization key generation number. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of generating an authorization key corresponding to an authenticated subscriber station in a wireless communication system, the method comprising:
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acquiring, at a base station, an authorization key based on an authorization key generation number; transmitting, at the base station, an SA-Traffic Encryption Key (SA-TEK) challenge message including the authorization key generation number and a message authentication code for performing message authentication function to the subscriber station; receiving, at the base station, an SA-TEK request message from the subscriber station that has received the SA-TEK challenge message, the SA-TEK request message including an authorization key generation number and a message authentication code generated by the subscriber station; and transmitting, at the base station, an SA-TEK response message to the subscriber station so as to confirm that the base station and the subscriber station share the same authorization key and the same authorization key generation number. - View Dependent Claims (9, 10, 15, 16, 17, 18)
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8. A method of generating an authorization key corresponding to an authenticated subscriber station in a wireless communication system, the method comprising:
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receiving, at a subscriber station, an SA-TEK challenge message including an authorization key generation number and a message authentication code for performing message authentication function from a base station; transmitting, at the subscriber station, an SA-TEK request message including an authorization key generation number and a message authentication code to the base station; and receiving, at the subscriber station, an SA-TEK response message from the base station so as to confirm that the base station and the subscriber station share the same authorization key and the same authorization key generation number.
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11. A method of generating an authorization key corresponding to an authenticated subscriber station in a wireless communication system, the method comprising:
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generating, at a subscriber station, the authorization key on the basis of an authorization key generation number; transmitting, at the subscriber station, a ranging (RNG) request message including the authorization key generation number and a message authentication code for performing message authentication function to a base station; receiving, at the subscriber station, a RNG response message from the base station that has received the RNG request message, the RNG response message including an authorization key generation number and a message authentication code generated by the base station; and confirming, at the subscriber station, that the subscriber station shares the same authorization key and the same authorization key generation number as the base station when the subscriber station receives the valid RNG response message. - View Dependent Claims (13, 14)
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12. A method of generating an authorization key corresponding to an authenticated subscriber station in a wireless communication system, the method comprising:
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receiving, at a base station, a ranging (RNG) request message from the subscriber station, the RNG request message including an authorization key generation number and a message authentication code for performing message authentication function; generating, at the base station, a RNG response message including a authorization key generation number and a message authentication generated by the base station; and transmitting, at the base station, the RNG response message to the subscriber station so as to confirm that the subscriber station and the base station share the same authorization key and the same authorization key generation number.
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Specification