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1.
本文证明了好的线性分组码的编码器可作为好的线性局部随机序列发生器。此结论再一次揭示了纠错编码理论与现代密码学之间的有机联系。  相似文献   

2.
基于FPGA的伪随机序列发生器设计   总被引:4,自引:0,他引:4  
讨论了应用移位寄存器在Altera的FPGA芯片中实现线性和非线性伪随机序列的方法,该算法基于m序列本原多项式来获得线性m序列和非线性m子序列移位寄存器的反馈逻辑式。文中给出了以Altera的Quartus II为开发平台,并用VHDL语言实现的m序列的仿真波形。  相似文献   

3.
戚达 《电子设计应用》2003,(11):23-24,53
本文介绍了一种利用:EDA技术,在Altera的MAX 7000S系列芯片上实现的伪随机序列发生器,为产生低成本的电子系统测试信号提供了一种简单易行的方法。  相似文献   

4.
本文推导了“天书”密码模型及改进的非线性迭代算法:混沌函数。并揭示了混沌函数的部分性质及应用。  相似文献   

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一种基于CPLD的伪随机序列发生器   总被引:3,自引:0,他引:3  
介绍了一种利用 EDA技术 ,在 Altera的 MAX70 0 0 S系列芯片上实现的伪随机序列发生器 ,为产生低成本的电子系统测试信号提供了一种简单易行的方法  相似文献   

8.
钟控序列分析   总被引:4,自引:0,他引:4  
郭宝安 《通信学报》1990,11(6):50-56
对于流密码体制中使用的伪随机序列,我们要求它既要有尽可能大的线性复杂度,又要能抗相关攻击。本文讨论了一种新的具有以上特性的钟控伪随机序列,对这种序列的线性复杂度和统计特性进行了研究,并对其不安全的一类给出了一种有效的破译算法。  相似文献   

9.
丘嵘  袁方 《现代电子技术》2012,35(11):64-67
为产生随机性能良好的伪随机序列,提出了一个新的变结构混沌系统。该混沌系统在一个开关函数控制下其系统结构随时间随机地转换,所产生的混沌信号是两个不同的混沌信号的混合,具有良好的复杂性。基于该变结构混沌系统设计了一种伪随机序列发生器,采用NIST标准和STS-2.0b测试套件对其产生的伪随机序列进行了统计性能测试,测试结果表明该伪随机序列发生器具有良好的随机性,可应用于计算机、通信、信息加密等领域中。  相似文献   

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This paper proved the statement that a good linear block encoder is in fact a good local-random sequence generator. Furthermore, this statement discovers the deep relationship between the error-correcting coding theory and the modern cryptography.  相似文献   

12.
对时、频两域上BCH码的译码算法进行了对比分析,阐明了两类算法之间的相同处、不同处及其相互关系,给出了反映这种关系的算法流程图。分析结果表明:在译二进制码时,时域算法的运算量较少、实现比较容易;反之,在译非二进制码时,频域算法则更便于运算和实现。  相似文献   

13.
郭宝安  蔡长年 《电子学报》1993,21(1):101-103
通过对[1]中二元Bent序列的等价定义,本文给出了使用前馈网络生成二元Bent序列的快速方法,使二元Bent序列的产生比[2]中的方法简单,迅速。  相似文献   

14.
Since the security of all modern cryptographic techniques relies on unpredictable and irreproducible digital keys generated by random-number generators (RNGs), the realization of high-quality RNG is essential for secure communications. In this report, a new RNG, which utilizes single-electron phenomena, is proposed. A room-temperature operating silicon single-electron transistor (SET) having nearby an electron pocket is used as a high-quality, ultra-small RNG. In the proposed RNG, stochastic single-electron capture/emission processes to/from the electron pocket are detected with high sensitivity by the SET, and result in giant random telegraphic signals (GRTS) on the SET current. It is experimentally demonstrated that the single-electron RNG generates extremely high-quality random digital sequences at room temperature, in spite of its simple configuration. Because of its small-size and low-power properties, the single-electron RNG is promising as a key nanoelectronic device for future ubiquitous computing systems with highly secure mobile communication capabilities.  相似文献   

15.
跳频数字通信网中的用户干扰性能分析   总被引:5,自引:0,他引:5       下载免费PDF全文
跳频通信网中用户间跳频码碰撞会引起相互干扰,可采用独立碰撞模型和4碰撞态的马尔可夫模型加以研究。本文提出设定4种碰撞态下各有不同的误码和删除概率,可用来调整复杂信道模型参数的影响。我们注意到在用户数稳定时,4碰撞态的马尔可夫过程是平稳的,建议工程计算中采用可简化计算的独立碰撞模型。  相似文献   

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Given an m-sequence, the main factor influencing the least period of the Generalized Self-Shrinking (GSS) sequence is the selection of the linear combining vector G. Based on the calculation of the minimal polynomial ofL GSS sequences and the comparison of their degrees, an algorithm for selecting the linear combining vector G is presented, which is simple to understand, to implement and to prove. By using this method, much more than 2^L-l linear combining vectors G of the desired properties will be resulted. Thus in the practical application the linear combining vector G can be chosen with great arbitrariness. Additionally, this algorithm can be extended to any finite field easily.  相似文献   

17.
Video coding algorithms using block motion compensation were first developed for progressively scanned sequences and as such, are not entirely suitable for interlaced sequences In this paper we present a new approach for block-based coding of interlaced sequences. This proposed algorithm processes the interlaced sequence as a sequence of even and odd fields by using the last decoded field, adaptively deinterlaced, for the motion compensated prediction of the current field. The deinterlacing is performed at the decoder and no extra information has to be sent to guide the adaptation. The algorithm is a simple and efficient alternative to algorithms using the last two decoded fields for the motion compensated prediction of the current field. The new approach can easily incorporate the use of fast search algorithms and allows the use of true half-pixel accuracy in the estimates of the vertical component of the motion vectors. In HDTV sequences tested, this algorithm achieves superior performance due to this half-pixel accuracy.  相似文献   

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Binary sequences with large linear com-plexity have been found many applications in communi-cation systems. We determine the linear complexity of a family of p2-periodic binary sequences derived from poly-nomial quotients modulo an odd prime p. Results show that these sequences have high linear complexity, which means they can resist the linear attack method.  相似文献   

19.
提出一种通过调整天线单元之间的激励幅度而非相位来控制天线波束指向的方法。从全息干涉原理出发计算得到特定波束指向下各个单元的激励幅度值,根据该值对一维天线阵中各个单元的激励幅度进行设置后,天线实现了-30°到20°的扫描。将激励幅度连续值等效为“0”和“1”编码后,天线具备同样的扫描特性。设计了两款天线单元s1 和s2,在9.2 GHz 时两个单元的辐射效率为46%和4%,实现了与“1”和“0”编码的一一对应。在Rogers 4003基板上根据0°和-30°所对应的编码序列刻蚀相应的单元s1 和s2,加工得到两款天线N1 和N2。仿真和测试结果表明天线获得了良好的阻抗匹配特性,且天线波束指向分别为0°和-32°,验证了幅度加权方法在天线波束控制中的可行性。  相似文献   

20.
高洪青  褚红燕 《现代雷达》2007,29(1):31-33,37
首先给出了希尔波特解调过程,研究了相位编码信号的识别算法,接着对识别过程中存在的相位模糊问题提出了针对性的解决方法。基于上述算法,文中对二相编码信号、四相编码信号及多相码调制信号进行了仿真试验,得到了较好的效果,验证了文中算法的正确性和有效性,最后将算法应用于某雷达接收机的测试系统中,验证了其经济性和实用性。  相似文献   

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