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In 2010, Lee-Chen proposed an authenticated multiple keys exchange protocol based on bilinear pairings. Lee-Chen claimed that their proposed protocol not only is secure to a forgery attack, but also provides perfect forward secrecy. However, this paper points out that Lee-Chen's protocol is still insecure to a forgery attack and cannot provide perfect forward secrecy.
In 2007, Shim pointed out that AuthA protocol which is in the process of being standardized by IEEE are vulnerable to chosen protocol attacks and then suggested some coun- termeasures against the attacks. In this paper, we demonstrate another vulnerability of Shim's improved AuthA protocol and then present an improvement to repair the security flaws of the protocol.
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