A Threshold Signature Key Protection Scheme Based on Blind Technology

The current cryptosystem is widely used in all walks of life, while people on the network to transmit sensitive information security requirements are getting higher and higher. Therefore, the key protection issue also becomes particularly significant. In this paper, a scheme based on elliptic curve cryptosystem is proposed to address the problem of signature key protection. In this scheme, the signature key is saved by threshold first, reducing the risk of signature key disclosure that results from a single hijacking. And then the single point signature is applied to each signature fragmentation, the signature of core fragment is realized by blind technique. Finally, all signatures fragmentations are synthesized and verified. The analysis results show that the scheme effectively solves the security problem of the key in the case of occupying the smaller communication resources. The security of the scheme is based on the difficulty of solving discrete logarithm and the security of Shamir threshold secret sharing scheme.