字符加密问题

Question

比如有8个字符的字符串，如："11111111"，请问有什么办法能经过某个算法转换使其变成也是8个字符但却各异的字符串，假设为："?%8A60@1",又能经过一定的拟运算再将："?%8A60@1"变换回原先的"11111111"。请高手明示，谢谢！

Answer 1

有加密控件Base64,根据RFC2045定义规范加密. 
我用的是网上加密MD5 

Answer 2

http://topic.csdn.net/t/20050616/10/4086163.html

Answer 3

DES加密解密算法： 
public   string   EncryptString(string   sInputString,   string   sKey) 
                { 
                        byte[]   data   =   Encoding.UTF8.GetBytes(sInputString); 
                        DESCryptoServiceProvider   DES   =   new   DESCryptoServiceProvider(); 
                        DES.Key   =   ASCIIEncoding.ASCII.GetBytes(sKey); 
                        DES.IV   =   ASCIIEncoding.ASCII.GetBytes(sKey); 
                        MemoryStream   ms   =   new   MemoryStream();     //创建其支持存储区为内存的流。 
                        CryptoStream   cs   =   new   CryptoStream(ms,DES.CreateEncryptor(),CryptoStreamMode.Write);//将数据流连接到加密转换流 
                        cs.Write(data,0,data.Length); 
                        cs.FlushFinalBlock();     //用缓冲区的当前状态更新基础数据源或储存库，随后清除缓 
                        StringBuilder   ret   =   new   StringBuilder(); 
                        foreach   (byte   b   in   ms.ToArray()) 
                        { 
                                ret.AppendFormat( "{0:X2} ",b); 
                        } 
                        return     ret.ToString(); 
                } 
                //   DES解密字符串 
                public   string   DecryptString(string   sInputString,   string   sKey) 
                { 
                        DESCryptoServiceProvider   des   =   new   DESCryptoServiceProvider();                         //Put     the     input     string     into     the     byte     array     
                        byte[]   inputByteArray   =   new   byte[sInputString.Length/2]; 
                        for   (int   x   =   0;   x   <   sInputString.Length;   x+=2) 
                        { 
                                int   i   =   Convert.ToInt32(sInputString.Substring(x,2),   16); 
                                inputByteArray[x/2]   =   (byte)i; 
                        }                         des.Key   =   ASCIIEncoding.ASCII.GetBytes(sKey); 
                        des.IV   =   ASCIIEncoding.ASCII.GetBytes(sKey); 
                        MemoryStream   ms   =   new   MemoryStream(); 
                        CryptoStream   cs   =   new   CryptoStream(ms,   des.CreateDecryptor(),   CryptoStreamMode.Write); 
                        //Flush     the     data     through     the     crypto     stream     into     the     memory     stream     
                        cs.Write(inputByteArray,   0,   inputByteArray.Length); 
                        cs.FlushFinalBlock();                         //Get     the     decrypted     data     back     from     the     memory     stream     
                        //建立StringBuild对象，CreateDecrypt使用的是流对象，必须把解密后的文本变成流对象     
                        StringBuilder   ret   =   new   StringBuilder();                         return   System.Text.Encoding.UTF8.GetString(ms.ToArray());                     }

Answer 4

md5、AES加密、DES加密等不行吧，我要求的是加密前与加密后都是8个字符！

Answer 5

这个是我存储登陆数据库连接字符串的加解密方法，很简单就与或一下。
public string read()
        {   
            
            //读出连接字符串
            byte key = 126;//密钥
            string pi;  
            FileStream fsMyfile = new FileStream(Application.StartupPath+"\\config.dll", FileMode.Open, FileAccess.Read);
            int count2 = (int)fsMyfile.Length;
            byte[] buffer2 = new byte[count2];
            fsMyfile.Read(buffer2, 0, count2);
            for (int i = 0; i < count2; i++)
            {
                buffer2[i] = (byte)(buffer2[i] ^ key);//解密
            }
            fsMyfile.Close();
            pi = Encoding.Unicode.GetString(buffer2);
            return pi;
        }