【摘要】 在很多实际情况下,一个被所有人都信任的可信中心并不存在,因此提出一种无可信中心的门限密钥共享方案。该方案基于Shamir秘密共享体制,利用拉格朗日插值法恢复秘密。在本方案中,如果有若干个托管代理不愿合作或无法合作时,监听机构仍能较容易地重构会话密钥;不但解决了"一次监听,永久监听"的问题,而且避免了监听机构权力过大的现象。除此之外,本方案中每个托管代理可以验证其所托管的子密钥的正确性。结论表明,本方案功能更加完善,安全性更高。更多还原

【Abstract】 In most parctical circumstances,there isn’t an authority which can be trusted by all members,so this paper proposed a threshold scheme without a trusted party.This paper constructed the scheme on the basis of Shamir’s perfect secret sharing system and used Lagrange interpolation to restore the secret.In this scheme,monitor agency could easily reconstruct session key when few escrow agency could’t cooperation.It not only effectually prevented form law enforcement decryptor too much power,but also solved effectively the problem of"once monitor,monitor for ever".Besides,every escrow agency could verify correctness of the secret shadow that it escrowed.It cometo a conclusion that the new designed scheme is more perfect and more security.更多还原