【摘要】 本文基于ＥＬＧａｍ ａｌ公钥体制和多级可验证共享方案提出了一个新的可验证部分密钥托管方案。它不仅能达到“延迟恢复”的目的，而且可有效地克服监听机构权力过大和易受潜信道攻击的缺点更多还原

【Abstract】 This paper proposes a new scheme of verifiable partial key escrow,based on ELGamal public key cryptosystem and multilevel secret sharing protocol,which satisfies “delayed recovery”,but also effectually prevents against LED(Law Enforcement Decryptor)too much power and subliminal channels attack.更多还原