密钥恢复允许一个授权的机构恢复数据加密密钥，以恢复被加密信息。在提供相同安全的条件下，椭圆曲线密码体制比其它公钥密码体制需要更小的密钥长度、计算开销和带宽，具有更广泛的适用性。本文提出一种基于椭圆曲线密码体制的两阶段密钥恢复方案，实验结果表明该方案安全高效。%Key recovery allows authorized parties to retrieve the cryptographic keys used for data confidentiality,with the ultimate goal of the recovery of encrypted data.By offering similar levels of security,the Elliptic Curve Cryptosystem(ECC) provides greater efficiency than either integer factorization systems or discrete logarithm systems,in terms of computational overheads,key sizes,and bandwidth.This paper presents a two-phase key recovery method based on the elliptic curve cryptosystem.The experiment shows this method is secure and highly efficient.
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