Provable security of ID-based proxy multi-signature schemes

2007 ◽  
Vol 12 (1) ◽  
pp. 87-90 ◽  
Author(s):  
Chunxiang Gu ◽  
Yuefei Zhu ◽  
Tao Zhao
2011 ◽  
Vol 282-283 ◽  
pp. 307-311
Author(s):  
Li Zhen Ma

Any one who knows the signer’s public key can verify the validity of a given signature in partially blind signature schemes. This verifying universality may be used by cheats if the signed message is sensitive or personal. To solve this problem, a new convertible user designating confirmer partially blind signature, in which only the designated confirmer (designated by the user) and the user can verify and confirm the validity of given signatures and convert given signatures into publicly verifiable ones, is proposed. Compared with Huang et al.’s scheme, the signature size is shortened about 25% and the computation quantity is reduced about 36% in the proposed scheme. Under random oracle model and intractability of Discrete Logarithm Problem the proposed scheme is provably secure.


2019 ◽  
Vol 11 (6) ◽  
pp. 77 ◽  
Author(s):  
Demba Sow ◽  
Mamadou Ghouraissiou Camara

A new variant of the ElGamal signature scheme called "a Generalized ElGamal signature scheme" is proposed in 2011. The Generalized ElGamal signature scheme is a modified ElGamal signature scheme. In this paper, we propose the security proof of the Generalized ElGamal signature scheme in the random oracle model. First, we recall some security notions of signature schemes and show the security of the modified ElGamal Signature scheme.


2020 ◽  
Vol 35 (24) ◽  
pp. 2050197
Author(s):  
Xiangjun Xin ◽  
Qinglan Yang ◽  
Fagen Li

A quantum proxy signature scheme makes the proxy signer can generate a quantum signature on behalf of the original signer. Although many quantum proxy signature schemes have been proposed, none of them can be formally proved to be secure. There is not even security model for the quantum proxy signatures. Some quantum proxy signature schemes have been proved to be insecure against forgery attacks. In this paper, first, the formal definition and the corresponding security model for the quantum proxy signatures are proposed. Second, based on the Hadamard operator and the controlled NOT operation, a new quantum proxy signature scheme is proposed. The security of our quantum proxy signature scheme can be formally proved under security model. The security model of the quantum proxy signatures is helpful for analyzing and improving the security of the quantum proxy signature schemes. On the other hand, compared with the other quantum proxy signatures, the new one proposed in this paper is the first that can be formally proved to be secure under security model.


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