最简单的字符串加密C#实现:移位加密

王朝c#·作者佚名  2006-11-24
窄屏简体版  字體: |||超大  

/*

Filename: encrypt_string.cs

Author : zhanghua

Date : 2005-08-11

Fuction : input a strig and encrypt a string

加密后的字符串的第一个字符是原先字符串的最后一个字符,

其余的每一个字符是对应的原字符串中的前一个字符的值加

上3。

example: welcome -> ezhofrp

*/

using System;

class Test

{

public static void Main()

{

string strInput, strOutput;

Console.WriteLine("please input a string to encrypt: \n");

strInput=Console.ReadLine();

Console.WriteLine(" your input string is : {0}\n", strInput);

//Encrypt(strInput);

strOutput = Encrypt(strInput);

Console.WriteLine("strOutput is :{0}\n", strOutput);

}

private static string Encrypt(string strInput)

{

string strFont, strEnd;

string strOutput;

char[] charFont;

int i,len, intFont;

len = strInput.Length;

//Console.WriteLine(" strInput 's length is :{0} \n", len);

strFont = strInput.Remove(len-1,1);

strEnd= strInput.Remove(0, len-1);

//Console.WriteLine(" strFont is : {0} \n" , strFont);

//Console.WriteLine(" strEnd is : {0} \n" , strEnd);

charFont = strFont.ToCharArray();

for(i=0; i<strFont.Length; i++)

{

intFont = (int)charFont[i] + 3;

//Console.WriteLine(" intFont is : {0} \n", intFont);

charFont[i]= Convert.ToChar(intFont);

//Console.WriteLine("charFont[{0}] is : {1}\n", i, charFont[i]);

}

strFont = ""; //let strFont null

for (i=0; i<charFont.Length; i++)

{

strFont += charFont[i];

}

strOutput=strEnd + strFont;

return strOutput;

}

}

 
 
 
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