Cryptology ePrint Archive: Report 2009/423

Utilizing postponed ephemeral and pseudo-static keys in tripartite and identity-based key agreement protocols

Atsushi Fujioka and Koutarou Suzuki and Berkant Ustaoglu

Abstract: We propose an new one-round implicitly authenticated three-party protocol that extends Joux's protocol as well as a two-party identity-based protocol. Our protocols have a single communication round that consists of ephemeral (one-time) public keys along with certificates in the tripartite protocol, and identities in the identity-based setting. As such our protocols are communication efficient and furthermore do not require enhanced message format.

Category / Keywords: public-key cryptography / postponed ephemeral keys, pseudo-static keys, tripartite key agreement, identity based key agreement

Date: received 30 Aug 2009

Contact author: bustaoglu at cryptolounge net

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Version: 20090901:080920 (All versions of this report)

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