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针对理想格相比一般格可以在不降低安全性的基础上,减少密钥量、缩短密钥长度、降低运行开销的优点。将理想格上的优势与一般格上的不经意传输协议结合,把2012年欧密会上Peiker提出的格上陷门函数生成算法扩展到理想格上,提出基于理想格上的1-out-of-n不经意传输协议方案。利用理想格上的基于错误学习问题的陷门单向函数,保证了协议发送方和接收方的隐私性,并证明了协议的完备性和安全性。效率方面,协议中使用的计算是小整数的模乘和模加,有很高的计算效率;并且使用理想格有效的限制明密文长度和密钥量,减少了通信成本。 相似文献
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In the post quantum era, public key cryptographic scheme based on lattice is considered to be the most promising cryptosystem that can resist quantum computer attacks. However, there are still few efficient key agreement protocols based on lattice up to now. To solve this issue, an improved key agreement protocol with post quantum security is proposed. Firstly, by analyzing the Wess-Zumino model + ( WZM + ) key agreement protocol based on small integer solution (SIS) hard problem, it is found that there are fatal defects in the protocol that cannot resist man-in-the-middle attack. Then based on the bilateral inhomogeneous small integer solution (Bi-ISIS) problem, a mutual authenticated key agreement (AKA) protocol with key confirmation is proposed and designed. Compared with Diffie-Hellman (DH) protocol, WZM + key agreement protocol, and the AKA agreement based on the ideal lattice protocol, the improved protocol satisfies the provable security under the extend Canetti-Krawczyk (eCK) model and can resist man-in-the-middle attack, replay attack and quantum computing attack. 相似文献
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