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| 1 | A public key cryptosystem based on data complexity under quantum environment显示文摘Since the Shor algorithm showed that a quantum algorithm can efficiently calculate discrete logarithms and factorize integers, it has been used to break the RSA, EIGamal, and ECC classical public key cryptosystems. This is therefore a significant issue in the context of ensuring communication security over insecure channels. In this paper, we prove that there are no polynomial-size quantum circuits that can compute all Boolean functions(of which there are 22ncases) in the standard quantum oracle model. Based on this,we propose the notion of data complexity under a quantum environment and suggest that it can be used as a condition for post-quantum computation. It is generally believed that NP-complete problems cannot be solved in polynomial time even with quantum computers. Therefore, a public key cryptosystem and signature scheme based on the difficulty of NP-complete problems and the notion of data complexity are presented here. Finally,we analyze the security of the proposed encryption and signature schemes. | WU WanQing ZHANG HuanGuo WANG HouZhen MAO ShaoWu JIA JianWei LIU JinHui | 2015 | Science China(Information Sciences)2015，58，11： | 6 |
| 2 | LDPC卷积码在水声通信系统中的可靠性研究显示文摘为保证信号在水声信道上实现高可靠性传输,将低密度奇偶校验卷积码用于水声信道,研究其对信息可靠性的改进程度。采用结合了多径模型的梯度模型来模拟水声信道,依据滤波器组多载波技术抑制码间串扰和偏移正交幅度调制能够抑制相邻载波干扰的特性,搭建FBMC/OQAM水声信道通信系统。采用低密度奇偶校验卷积码作为信道编码方案,实现了多媒体音频和图像信号在水声信道上的无损传输。又进一步搭建了跳频水声通信仿真系统,将RC-LDPC卷积码用于该跳频水声通信系统,研究其译码性能。仿真结果表明,低密度奇偶校验卷积码在水声信道上有良好的误码率性能,实现了低误码率的信号传输,能有效地克服多径效应,提高信道利用率。因而,低密度奇偶校验卷积码可选作水声通信的信道编码方案。 | 蔡子浩 穆丽伟 占利 刘强 | 2020 | 西安电子科技大学学报2020，47，6： | 2 |
| 3 | 一种改进的时不变LDPC卷积码构造方法显示文摘提出一种新的时不变LDPC卷积码构造算法。对Tanner等的构造方案进行改进,产生了给定码率下的LDPC卷积码多项式矩阵;根据卷积码特性,对该多项式矩阵进行修正,获得具有最大给定编码记忆和快速编码特性的改进的时不变LDPC卷积码。该算法具有的快速编码特性可以降低硬件实现时的编码复杂度。该算法获得的在给定码率下具有最大给定编码记忆的特性可提高译码性能。对码的特性参数和仿真结果的分析表明,文中构造的时不变LDPC卷积码是优异的。 | 穆丽伟 刘星成 | 2016 | 中山大学学报(自然科学版)2016，55，1： | 1 |
| 4 | Construction of Rate-Compatible(RC) Low-Density Parity-Check(LDPC) Convolutional Codes Based on RC-LDPC Block Codes显示文摘In this paper,a family of rate-compatible(RC) low-density parity-check(LDPC) convolutional codes can be obtained from RC-LDPC block codes by graph extension method.The resulted RC-LDPC convolutional codes,which are derived by permuting the matrices of the corresponding RC-LDPC block codes,are systematic and have maximum encoding memory.Simulation results show that the proposed RC-LDPC convolutional codes with belief propagation(BP) decoding collectively offer a steady improvement on performance compared with the block counterparts over the binary-input additive white Gaussian noise channels(BI-AWGNCs). | 穆丽伟 韩国军 刘志勇 | 2016 | Journal of Shanghai Jiaotong university(Science)2016，21，6： | 1 |
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