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本文利用椭圆曲线上的双线性对提出一个新的基于身份的多重签密方案,解决以前的传统证书式多重签密方案的证书管理,传递等繁琐问题.并进行了安全性分析,在BDH问题是困难的假设下方案是安全的.签密能够在一个逻辑步骤内同时完成保密和认证两项功能,而其计算量和通信成本都要低于传统的“先签名后加密”,在电子商务等方向有很好的应用前景。 相似文献
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In this paper, we show how to use the dual techniques in the subgroups to give a secure identitybased broadcast encryption(IBBE) scheme with constant-size ciphertexts. Our scheme achieves the full security (adaptive security) under three static (i.e. non q-based) assumptions. It is worth noting that only recently Waters gives a short ciphertext broadcast encryption system that is even adaptively secure under the simple assumptions. One feature of our methodology is that it is relatively simple to leverage our techniques to get adaptive security. 相似文献