Cryptology ePrint Archive: Report 2012/332

A Non-delegatable Identity-based Designated Verifier Signature Scheme without Bilinear Pairings

Maryam Rajabzadeh Asaar and Mahmoud Salmasizadeh

Abstract: Up to now, several non-delegatable identity-based (strong) designated verifier signature schemes using bilinear pairings are proposed. In these identity-based (strong) designated verifier signature schemes, bilinear pairings are employed either in signing and verifying steps or only in the verifying step. However, the computation cost of pairings at a security level equivalent to a 128-bit symmetric key of AES is approximately 20 times higher than that of exponentiation over an elliptic curve group. Hence, presenting a (strong) designated verifier signature scheme which is identity-based without pairings and supports non-delegatability as well is vital. In this study, a non-delegatable identity-based designated verifier signature scheme without bilinear pairings using two concatenated Schnorr signatures is proposed. Our construction not only is approximately 40 times more efficient compared to the existing non-delegatable identity-based (strong) designated verifier signature schemes due to the avoiding bilinear pairings but also it is provable secure in the random oracle.

Category / Keywords: public-key cryptography /

Date: received 12 Jun 2012

Contact author: asaar at ee sharif edu

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Version: 20120622:193058 (All versions of this report)

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