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考虑到很多门限签名方案都不抵抗恶意PKG攻击的事实,本文提出了一个无可信中心下基于身份的门限签名方案,避免了该类型攻击.在该方案中,每一个签名参与者都可以验证公钥和公钥份额的合法性,从而避免了公钥份额替换攻击.给出了无可信中心下基于身份的门限签名方案不可伪造性的安全模型,并利用此安全模型给出了该方案在标准模型下的安全性证明. 相似文献
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该文给出了零相关区(ZCZ)阵列偶集的一种递归构造方法。利用正交矩阵,对具有相同主峰值的阵列偶集进行交织和直积构造。由该方法得到的阵列偶集不仅具有更大的体积,而且保持了良好的相关特性。此方法可以推广为ZCZ屏蔽阵列偶集的递归构造。 相似文献
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To solve the key escrow problem of the identity-based cryptosystem, Girault introduced the notion of a self-certified public key, which not only eliminates the need to authenticate a public key but also solves the key escrow problem. This paper proposes a Self-Certified Signature (SCS) scheme with message recovery and two variants without using bilinear pairings: one is the authenticated encryption scheme in which only the designated receiver can verify the signature, and the other is the authenticated encryption scheme with message linkage that deals with large messages. These three SCS schemes are provably secure in the random oracle model and are more efficient than previous schemes. 相似文献
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