A Robust Secure Self-Certified Concurrent Signature
Scheme from Bilinear Pairings
Chien-Hua Tsai1 and
Pin-Chang Su2
1Department of Accounting
Information, Chihlee University of Technology, 220 Taiwan
2Department
of Information Management, National Defense University, 112 Taiwan
Abstract: The idea of concurrent signature schemes is that two parties
produce two respective ambiguous signatures that are concurrently bound to
their corresponding signatories only while either of the party releases a
keystone. The main construct is that both parties need to reach a consensus on
the true fairness in mutually exchanging the signatures, and, moreover, the
protocols assume that there is no collusion between a trusted third party and
any of the parties. However, by collaborating over business interests with the
participants as strategic partners, the trusted third party may obtain access
to sensitive key data held in escrow, leading them to the collusion attack
associated with malicious intentions. To circumvent the misbehavior among the
participating individuals, an identity authentication process can be used prior
to exchanging or having access to any confidential information. In this paper,
we propose a self-certified concurrent signature from bilinear pairings as an alternative
solution to strengthen the security level for solving the fair exchange
problem. Apart from resisting to the collusion attack, the proposed scheme
provides the advanced security properties to prevent from the message
substitution, the identity forgery and impersonation, and other generic attacks
in an increasingly insecure network environment.
Keywords: Bilinear pairings, concurrent
signature, fair exchange, self-certified, trusted third party.
Received December 26, 2019;
accepted February 21, 2021