A Proactive Secret Sharing Scheme Based on the Elliptic Curve Cryptosystem
Yi Zhuang · Computer Technology and Development · 2007
It's insufficient just to apply the classic cryptography as well as threshold cryptosystems.Only proactive secret sharing can properly protect it.Proactive secret sharing is a non-trivial extension of(t,n) threshold cryptosystems,where shares are periodically renewed(without changing the secret) in such a way that information gained by the adversary in one time period is useless for attacking the secret after the shares are renewed.Hence,the adversary willing to learn the secret needs to break to all t share holders or more than t share holders during the same time period.If the time period and the threshold t are selected properly,proactive secret sharing can maintain the overall security of the information.The article presents a proactive secret sharing scheme based on the Elliptic Curve Cryptosystem(ECC),including initialization of share,renewal of share,recovery of share and reconstruction of secret.The paper implements all algorithms of proactive secret sharing protocol.