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At IMA-Crypto & Coding' 99, A. M. Barmawi et al. proposed a robust protocol for generating shared RSA parameters, which was claimed to be secure and robust from cheaters and malicious parties. In this paper, we propose a cryptanalysis of A. M. Barmawi's protocol and show that every valid participating party can recover the factorization of the RSA modulus N with the computational complexity O(log...
In 2003, M.-S. Hwang et al. proposed a (t, n) threshold proxy scheme on RSA cryptosystem, which was proved insecure by G. Wang. Recently, Y.-F. Chang and X. Cheng proposed two improved RSA-based threshold proxy signature schemes respectively. In this paper, we propose the cryptanalysis of two schemes. Firstly, we point out that any t or more proxy signers can cooperatively recover the original singer's...
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