Practical Strong Designated Verifier Signature Schemes Based on Double Discrete Logarithms
Practical Strong Designated Verifier Signature Schemes Based on Double Discrete Logarithms
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DOI：
10.1007/11599548_10
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发表时间：
2005-12
期刊：
影响因子：
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通讯作者：
R. Tso;T. Okamoto;E. Okamoto
中科院分区：
文献类型：
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作者：
R. Tso;T. Okamoto;E. Okamoto
我们注意到，强指定验证者签名(SDVS)方案可以很容易地被任何安全的单向和两方认证的密钥协商方案实现。因此，与单向认证密钥协商方案和两方认证密钥协商方案相比，任何没有降低通信/计算开销或安全性的SDVS方案在实际应用中可能没有那么大的优势。本文提出了一种SDVS方案，该方案实现了较低的通信/计算开销，并且比现有的单向密钥协商方案和SDVS方案更有效。此外，我们还展示了如何删除该方案中使用的哈希函数，在该改进方案中，将提供增强的安全性，使得即使签名者的私钥被泄露，签名的一致性也不能被任何第三方确定。我们将使用随机预言模型来证明我们方案的安全性。
We notice that a strong designated verifier signature (SDVS) scheme can easily be realized by any secure one-way and two-party authenticated key agreement scheme. So any SDVS scheme without lower communication/computation cost or enhanced security comparing to these one-way and two-party authenticated key agreement schemes may have less advantage in practical use. In this paper, we introduce an SDVS scheme which realizes low communication/computation cost and is more efficient than current one-way key agreement schemes and SDVS schemes. In addition, we show how to remove a hash function used in this scheme where in this modified scheme, an enhanced security will be provided such that the consistency of a signature cannot be ascertained by any third party even if the signer’s private key is revealed. We will prove the security of our schemes using random oracle models.