Facilitating 802.11 roaming by pre-establishing session keys

A temporary key and group key technology, applied in data exchange network, wireless communication, digital transmission system, etc., can solve the time-consuming and inability to delay the 4-way handshake of reassociation

Inactive Publication Date: 2006-09-20
CISCO TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The reassociation 4-way handshake used to generate the PTK has proven to be too time consuming and cannot be delayed until after the reassociation exchange

Method used

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  • Facilitating 802.11 roaming by pre-establishing session keys
  • Facilitating 802.11 roaming by pre-establishing session keys
  • Facilitating 802.11 roaming by pre-establishing session keys

Examples

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Embodiment Construction

[0033] Reference is now made to the drawings, wherein the drawings are shown for the purpose of illustrating the preferred embodiments of the invention only and not for the purpose of limiting the invention. Figure 5 with Image 6 Methods, systems and articles of manufacture are shown schematically to optimize fast roaming in wireless networks by means of pre-authentication and early establishment of PTKs and reduced cryptographic computations in the re-association phase, where MK or PMK do not need to be propagated.

[0034] Such as Figure 5 As shown, the probe request 60 during the discovery phase 62 includes the PHKID to allow the AP 12 to pre-fetch the key. Although this adds some sort of slight latency in the probe response 64, the AP must acquire the key before responding.

[0035] According to a preferred embodiment of the present invention, a new 802.11 authentication type (described below) is defined to initialize the security association and establish the PMK dur...

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PUM

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Abstract

A method and system for pre-authenticating a pre-establishing key management on a roaming device prior to reassociation to facilitate fast hand-off in a wireless network is described. For enhanced mobility, both authentication and key establishment is performed prior to reassociation of the roaming device between access points. When the roaming device enters in contact with one of the access points, a local authentication is performed between the access point and the roaming device prior to reassociation with the access point to allow for fast hand-offs of the device between access points within the network.

Description

Background technique [0001] This application claims priority to US Provisional Patent Application No. 60 / 511,187, filed October 14, 2003, and US Provisional Patent Application No. 60 / 473,507, filed May 27, 2003. [0002] Wireless local area networks (wireless LANs or WLANs) have changed the landscape of computer networking. The use of mobile computing devices such as laptops and personal digital assistants, and the need for continuous network connectivity without "plugging in" is driving the adoption of enterprise WLANs. [0003] WLANs allow end users to access e-mail, schedule meetings, and access files and applications on corporate or university networks from conference rooms, classrooms, collaborators' desks, and virtually anywhere. With wireless networking, end users can access key information and applications with just a mouse click, no matter where they are. [0004] As reliance on WLANs continues to grow, businesses are increasingly concerned about network security. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/28H04Q7/38H04L12/56H04L29/06H04W12/06H04W36/08H04W84/12
CPCH04L63/061H04L63/123H04L63/08H04L63/162H04L2209/80H04W84/12H04W12/04H04W12/06H04W36/0016H04W36/0088H04W12/062
Inventor 南希·卡姆温恩特
Owner CISCO TECH INC
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