The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 25, 2012
Filed:
Jul. 30, 2007
Joao Girao, Ludwigshafen, DE;
Frederik Armknecht, Worms, DE;
Alfredo Matos, Aveiro, PT;
Rui Luis Aguiar, Aveiro, PT;
Joao Girao, Ludwigshafen, DE;
Frederik Armknecht, Worms, DE;
Alfredo Matos, Aveiro, PT;
Rui Luis Aguiar, Aveiro, PT;
NEC Europe, Ltd., Heidelberg, DE;
Abstract
A method for establishing a secret key between two nodes in a communication network, in particular in a wireless local area network (WLAN), includes concealment of the fact that a key exchange occurs, one of the nodes—first node (B)—broadcasts one or more packets (P) that can be received by the other node—second node (A)—, wherein the packets (P) contain each a first key (K) and wherein the packets (P) are each encrypted with a second key (k) before being sent, the second node (A) randomly chooses one packet (P) from the packets (P) received and breaks the encryption of the chosen packet (P) in order to obtain the first key (K), and the second node (A) initiates a key exchange protocol, wherein the second node (A) encrypts the message to be sent for initiating the key exchange protocol with the revealed key (K).