Method and system for pre-authentication

Details Method and system for pre-authentication Method and system for pre-authentication

2004-07-15

2008-11-11

Parthasarathy, Pramila (Department: 2136)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

C713S168000, C380S047000

Reexamination Certificate

active

07451316

ABSTRACT:
A wireless station prepares to roam by pre-authenticating itself with a neighboring access point. The wireless station sends a rekey request, which can include an incremented rekey number. The wireless station receives a rekey response. The rekey response can include the incremented rekey number. Because the wireless station is pre-authenticated, after it roams it only needs to perform a two-way handshake with a new access point to establish secure communications with the new access point. The two-way handshake starts by the wireless station sending a reassociation request to the neighboring access point, the reassociation request comprising the incremented rekey number established during pre-authentication. The wireless station receives a reassociation response from the neighboring access point. To protect against replay attacks, the neighboring access point can verify the rekey number sent in the reassociation request matches the rekey number sent in the rekey response.

REFERENCES:
patent: 5940508 (1999-08-01), Long et al.
patent: 7243234 (2007-07-01), Newkirk
patent: 7245724 (2007-07-01), Chesson et al.

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