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On security enhancement of long-term private key for the tripartite authenticated key agreement protocol

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2 Author(s)
Masahiro Nomura ; Graduate School of Science and Technology, Chiba University, 1-33 Yayoi, Inage, 263-8522, Japan ; Katsuhiro Nakamura

In this paper, we propose a scheme that enhances the security of long-term private key lID used in the tripartite authenticated key agreement protocol. In this scheme, we use (H(lIDPmacr)lID)P (H: hash function) instead of lIDP (P: a rational point of the defined elliptic curve over Fp) as a static public key and tauID1, tauID2 as two ephemeral private keys. From this, even though the bit length of p (p's security parameter) is more lessened, we can preserve equal security to conventional schemes in respect of the secrecy of the long-term private key.

Published in:

Information Theory and Its Applications, 2008. ISITA 2008. International Symposium on

Date of Conference:

7-10 Dec. 2008