摘要数字签名,是保证数据可靠性,实现认证的重要工具。它在信息安全、身份认证、数据完整性、不可否认性以及匿名性等方面有着广泛的应用。
其中Schnorr数字签名方案,它的安全性是基于离散对数的困难性。其产生签名的速度快,签名长度短,具有安全性好运行效率高的特点。
数字签名中,一旦签名密钥被泄漏,由该密钥签名的文档就变得无效。为了减少这种损失，本文提出Schnorr数字签名方案的状态化思想方法,即将密钥分割成两块存储,在每次使用时先对各块进行更新。依次使用各块做签名操作,最终得到用完整私钥签名的结果。 并对该方案的安全性进行分析,可以使其密钥的保存和使用更加安全,能有效抵抗对签名方案的密钥泄露攻击。
关键词：Schnorr数字签名体制；密钥封装；状态化的思想方法；安全性分析
Abstract：The digital signatures, is to ensure data reliability, and it is also an important tool to achieve certification. In the information security、authentication、 data integrity、 non-repudiation and anonymity, it have a wide range of applications.
Schnorr digital signature scheme, whose security is based on the difficulty of discrete logarithm. It produces signature quickly, and the length of the signature is short, with good security and high efficiency.
In the digital signature, if the signature key is leaked, the document signed by the key becomes invalid. In order to reduce such losses, this paper present the state method of Schnorr digital signature scheme, the key is divided into two stores, first of all, each time you use the block must to be updated. Use the block in order to do the signature operation, and finally get the results with the full private key signed.
Finally, else analyzed the security and efficiency of the scheme, proving that the scheme is secure and effective.
Key words: Schnorr digital signature scheme；key encapsulation; state method; threshold scheme; security analysis
本文借鉴了前向安全的特性,提出了一种基于Schnorr数字签名方案的状态化方法.该方案实现私钥的分割,其思想是把私钥分成两块存储,并在每次使用时先更新各块的状态.之后依次使用各块做签名或解密操作,并最终得到用完整的私钥签名的结果,从而实现数据安全和权力制约.并且,该方案具有前向安全的特征，具有较强的抵抗密钥泄露攻击和防止内部欺骗的功能.状态化思想可以使私钥的保存和使用更加安全.
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