Abstract: This paper proposes a multistage threshold key escrow scheme, based on Elgamal public key cryptosystem and Shamir threshold method. This scheme can effectively resist subliminal channel attack, prevent supervision agency to have too much power, verify the secret pieces of the user's private key, and disclose the failure or corrupted escrow agents.

摘要： 基于ＥｌＧａｍａｌ公钥体制和Ｓｈａｍｉｒ门限方法，设计了一个多级门限密钥托管方案，方案不仅能克服阈下攻击和监听机构权力过大的缺点，也可以验证用户私钥密钥片的正确性，并且能识别失效的托管代理。

关键词: ElGamal公钥算法, 密钥托管, 门限方案, 密钥分拆

CLC Number: 

• TP393.08