本文只提供实现方法，建议读者先自行了解相关知识，再阅读本文代码。
结果截图：
C++代码:
// LFSR.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。//#include <iostream>#include <stdlib.h>#include <bitset>#define n 4using namespace std;string BitStrToStr(string bstr){ string str = ""; //每八位转化成十进制，然后将数字结果转化成字符 int sum; for (int i = 0; i < bstr.size(); i += 8) { sum = 0; for (int j = 0; j < 8; j++) if (bstr[i + j] == '1') sum = sum * 2 + 1; else sum = sum * 2; str = str + char(sum); } return str;}int main(){ bitset<n> bint(6); bitset<n> str(bint); string s1, s2; /*for (int i = bint.size() - 1; i >= 0; i--) cout << bint[i];*/ cout << "初始状态为：" << bint.to_string() << endl; do { s1 = bint.to_string(); s2.push_back(s1[3]); int j = bint[n - 1] ^ bint[0]; bint.operator>>=(1); bint[n - 1] = j; } while (str.to_string() != bint.to_string()); cout << "输出序列为：" << s2 << endl; string msg = "hello,world!"; string cip = ""; for (int i = 0; i < msg.size(); i++) { bitset<8> bits = bitset<8>(msg[i]); string temp = bits.to_string(); cip = cip+temp; } cout << "明文：" << msg << endl;; cout <<"明文二进制：" <<cip << endl; int len = s2.length(); for (int i = 0; i < cip.size(); ++i) { if (cip[i] != s2[i % len]) { cip[i] = '1'; } else { cip[i] = '0'; } } cout <<"密文二进制："<< cip << endl; //cout << "密文直译：" << BitStrToStr(cip)<<endl; for (int i = 0; i < cip.size(); ++i) { if (cip[i] != s2[i % len]) { cip[i] = '1'; } else { cip[i] = '0'; } } cout << "密文解译：" << BitStrToStr(cip); return 0;}