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Lecture notes in computer science

Security Analysis of Standard Authentication and Key Agreement Protocols Utilising Timestamps

Manuel Barbosa, Pooya Farshim

Published Jan 1, 2009• 9 citations
Publisher
DOI
10.1007/978-3-642-02384-2_15

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The security of a provably secure identity-based authenticated key agreement protocol in the standard model was analyzed,and it was found that the protocol used in escrowless mode has security flaws.When the private key generator(PKG) is controlled or attacked,all of the session keys can be obtained.To resist this attack,the identity-based authenticated key agreement protocol was improved.This new protocol was proven to be secure in the standard model and has the property of not needing session key escrow.
The security of a recently proposed ID-based authenticated key agreement protocol was analyzed. Although it is provably secure in the standard model, a malicious PKG （private key generator） can still obtain all of the agreed ses-sion keys, that is, it doesn’t provide PKG-forward secrecy in escrowless mode. To satisfy the security requirement in es-crowless mode, an improved version of the protocol was presented and it was proved to be a secure authenticated key agreement in the standard model. Results show that it provides perfect forward secrecy and PKG-forward secrecy.