Method using access authorization differentiation in...

Details Method using access authorization differentiation in... Method using access authorization differentiation in...

2003-06-26

2010-06-15

Hoffman, Brandon S (Department: 2436)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

C455S439000

Reexamination Certificate

active

07739491

ABSTRACT:
An encryption key distribution method capable of performing fast roaming by differentially distributing encryption keys in advance, according to access authorization classes, in a wireless access network and a roaming method using distributed encryption keys are provided. The encryption key distribution method comprises: receiving a command to communicate with an access point not available for communication using an encryption key currently selected in the encryption key set; determining access authorization of the access point not available for communications; selecting an encryption key from the encryption key set obtained in advance corresponding to the determined access authorization; and using the selected encryption key to encrypt a transmission message and communicate with the access point not available for communication. The method reduces the delay time, which is caused by encryption key distribution while a wireless terminal is traveling, such that roaming and a hand-off are carried out quickly and safely, and user convenience and safe transmission of data are achieved.

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European Search Report dated Dec. 29, 2003 issued in a counterpart application, namely, Appln. No. 03254271.4.
Wang et al., “Policy-Enabled Handoffs Across Heterogeneous Wireless Networks”, 1999 IEEE, pp. 51-60.

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