关键词: 指定验证者签名, 边信道攻击, 相对泄露模型, 公开验证, 数字签名

Abstract: Designated Verifier Signature (DVS) eliminates the publicly verifiable feature of traditional digital signature to prevent a verifier from proving to a third party the fact that a particular digital signature held by him is issued by a signer. Traditionally, security of digital signature schemes relies on the ideal assumption that an adversary has no access to the information of a secret key. However, side-channel attacks show that the physical implementation of a cryptographic algorithm will leak partial secret information to an adversary. Hence it is necessary to design a leakage-resilient designated verifier signature. Okamoto authentication scheme was converted into a designated verifier signature scheme by using the OR proof technique. Given the leakage bound, the security of the presented scheme was proved under the relative leakage model.

Key words: Designated Verifier Signature (DVS), side-channel attack, relative leakage model, public verifiability, digital signature