[加密]C#实现维吉尼亚加密与解密（解密前提为已知密匙）

来源：互联网发布：中国教育现状知乎编辑：程序博客网时间：2024/05/16 08:44

using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Windows.Forms;namespace Vigenere{    public partial class Form1 : Form    {        private string[,] matrix = new string[26, 26];        private ASCIIEncoding ascii = new ASCIIEncoding();        //key        private string key;        //code        private string code;        //text        private string text;        public Form1()        {            InitializeComponent();            #region Generate Virginia Martix            for (int i = 0; i < 26; i++)            {                for (int j = 0; j < 26; j++)                {                    int number = 65 + i + j;                    if (number > 90)                    {                        number -= 26;                    }                    byte[] bt = new byte[] { (byte)number };                    matrix[i, j] = ascii.GetString(bt);                }            }            #endregion        }        //加密        private void button1_Click(object sender, EventArgs e)        {            key = this.txtKey.Text.ToString().ToUpper();            code = "";            text = this.txtText.Text.ToString().ToUpper();            List<int> keyNum = new List<int>(); ;            for (int i = 0; i < key.Length; i++)            {                string str = key.Substring(i, 1);                keyNum.Add((int)ascii.GetBytes(str)[0] - 65);            }            int index = -1;            for (int i = 0; i < this.text.Length; i++)            {                if (this.text.Substring(i, 1).ToString() == " ")                {                    code += " ";                    continue;                }                index++;                code += matrix[keyNum[index % key.Length], (int)ascii.GetBytes(this.text.Substring(i, 1))[0] - 65];            }            this.txtCode.Text = code.ToString();        }        //解密        private void button2_Click(object sender, EventArgs e)        {            key = this.txtKey.Text.ToString().ToUpper();            code = this.txtCode.Text.ToString().ToUpper();            text = "";            List<int> keyNum = new List<int>(); ;            for (int i = 0; i < key.Length; i++)            {                string str = key.Substring(i, 1);                keyNum.Add((int)ascii.GetBytes(str)[0] - 65);            }            int index = -1;            for (int i = 0; i < this.code.Length; i++)            {                if (this.code.Substring(i, 1).ToString() == " ")                {                    text += " ";                    continue;                }                index++;                for (int j = 0; j < 26; j++)                {                    if (this.code.Substring(i, 1).ToString() == matrix[keyNum[index % key.Length], j])                    {                        byte[] bt = new byte[] { (byte)(j + 65) };                        text += ascii.GetString(bt);                    }                }            }            this.txtText.Text = text.ToString();        }    }}

对于维吉尼亚方阵及运用维吉尼亚方阵的加密与解密，可参考http://baike.baidu.com/view/270838.htm?fromTaglist

画面结果如下：

转自：http://www.cnblogs.com/coding4love/p/3296703.html