lfsr

Use lfsr to build an Error Compensation System First, understand what lfsr is. Linear Feedback Shift Register (lfsr) is the most basic standard module structure in the internal test circuit. It uses both pseudo-random test code generator and feature analyzer for compressing test result data. An n-order lfsr consists of

I. task: Hardware Logic Design of Linear Feedback Shift Register (lfsr) is required on Xilinx Virtex-6 board by using the language of Xilinx. Ii. preparations: Basically, the following software is required to complete a simple design: Logic: uedit32 (recommended for hardware dogs) Overall: ise14.1 Simulation: Modelsim se 10.1b Analysis: chipscope pro Iii. Design Process Logic: First of all, it is RTL-level design, commonly known as hardware logic desi

Module lfsr (input CLK, input rst_n, output out); Reg [] q = 10'b1010101010; wire tap = Q [2] ^ Q [9]; assign out = Q [9]; always @ (posedge CLK, negedge rst_n) if (! Rst_n) q Assign the initial value of lfsr to 1010101010, the minimum value is q0 = Q2 XOR Q9, and the output value is the highest Q9; TestProgramAs follows: 'Timescale 1 NS/1 nsmodule lfsr_tb (); localparam T = 20; // clock period Re

addition to the remainder, if the remainder of the register with the number of registers, modulo 2 in addition to the XOR gate, then the general CRC serial circuit can be the same as the circuit shown in Figure 6.2 to achieve. LFSR (Linear Feedback shift register) in the calculation process, the linear feedback shift register is a shift register: its input bit is a linear function of the previous state. 7.1 The blue box is the input bit, and the pre

Level 4:vigenere cipher encryption, can fight word frequency statistics, need to know the password, this problem know the key length 6.Http://www.simonsingh.net/The_Black_Chamber/crackingprinciple.htmlThis site explains how to hack vigenere cipher encryption.http://smurfoncrack.com/pygenere/pygenere.phpDirectly copy the ciphertext to the above page, you can guess the password "Frekey".Use this password to uncover the secret text.Level 5: Encrypts the same level 4, but does not know the key lengt

A5-1加密算法 1、基本原理 A5-1加密算法是一种流密码，通过密钥流对明文进行加密，然后用密钥流进行对密文的解密操作。 这种算法主要用于GSM加密，也就是我们平时打电话的时候，通信数据发送到基站，基站发送到另一个基站，基站发送到接收方。 每次通话的时候，基站会产生一个64位的随机数，与我们手机sim卡内本身带的一个密码利用一种加密算法生成一个密钥，这个密钥就是这次通话过程中使用的主密钥，此密钥的生命周期为这一次通话的开始到结束。一旦通话完成，那么这个密钥也就没有用了。 该加密算法把整个通讯的数据划分为每一帧来进行加密。每一帧是有228位，其中发送端给接收端的数据114位，接收端反馈给发送端的数据有114位。除了上面提出的基站给出的64的总密钥，针对每一帧的加密，还有一种叫做会话密钥，这种会话密钥每加密一帧都会改变，会话密钥的生成是由帧号来决定的。每一次的会话密钥都会产生一个228位的乱数来加密这一帧的数据。加密的方式是异或。帧号一共用22位的二进制数来表示，也就是说一次通话只能传递2^22次方的通讯数据，因为每一次通话只有这么多帧可以进行加密数据并且传递。 A5-1算法基于三个线

"random bit generator" that generates a key stream based on a short key. The generator is used to generate the key stream, and the user simply remembers how to start the generator.One problem with designing LFSR for generating random bits is that for a given LFSR, you can generate the longest number of non-repeating sequence bits.RC4:The size of the RC4 varies according to the value of the parameter n . RC

password system 81.3.2 suitable key length: 101.4 modulo operations and a variety of classical passwords 111.4.1 modulo operation 121.4.2 Integer Ring 151.4.3 shift password (CAESAR password) 161.4.4 affine password 181.5 discussion and extended reading 191.6 Key Points Review 211.7 exercise 21Chapter 2 sequence code 272.1 Introduction 272.1.1 encryption and decryption of the sequence password and group password 27.2.1.2 292.2 random number and unbreakable group password 322.2.1 random number g

close to white noise, and has the prior certainty and repeatability. The so-called random-fingered correlation function is Gauss, and only autocorrelation is 1, which is close to 0. The so-called pseudo: refers to the resulting method is determined, that is, this sequence can have a certain method to repeat the generation, and has a cyclical, rather than the real random sequence is not repeatable and not cyclical. In communication from the usual use of LFSR