用C#写的压缩算法可以用Delphi解压出来
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    /*功能描述: 提供加密和解密的方法
    ******************************************************************/
    using System;
    using System.IO;
    using System.Security.Cryptography;
    using System.Text;namespace Encrypt
    {
    /// <summary>
    /// 加密和解密
    /// </summary>
    public sealed class EncryptDecrypt
    {
    public EncryptDecrypt(){} //默认密钥向量
    private  byte[] Keys = {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; /// <summary>
    /// 利用MD5对字符串进行加密
    /// </summary>
    /// <param name="encryptString">待加密的字符串</param>
    /// <returns>返回加密后的字符串</returns>
    public  string EncryptMD5(string encryptString)
    {
    MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();
    UTF8Encoding Encode = new UTF8Encoding();
    byte[] HashedBytes = md5Hasher.ComputeHash(Encode.GetBytes(encryptString));
    return Encode.GetString(HashedBytes);
    } /// <summary>
    /// DES加密字符串
    /// </summary>
    /// <param name="encryptString">待加密的字符串</param>
    /// <param name="encryptKey">加密密钥,要求为8位</param>
    /// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
    public  string EncryptDES(string encryptString,string encryptKey)
    {
    try
    {
    byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0,8));
    byte[] rgbIV = Keys;
    byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
    DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
    MemoryStream mStream = new MemoryStream();
    CryptoStream cStream = new CryptoStream(mStream,dCSP.CreateEncryptor(rgbKey,rgbIV),CryptoStreamMode.Write);
    cStream.Write(inputByteArray,0,inputByteArray.Length);
    cStream.FlushFinalBlock();
    return Convert.ToBase64String(mStream.ToArray());
    }
    catch
    {
    return encryptString;
    }
    } /// <summary>
    /// DES解密字符串
    /// </summary>
    /// <param name="decryptString">待解密的字符串</param>
    /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
    /// <returns>解密成功返回解密后的字符串,失败返源串</returns>
    public  string DecryptDES(string decryptString,string decryptKey)
    {
    try
    {
    byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
    byte[] rgbIV = Keys;
    byte[] inputByteArray = Convert.FromBase64String(decryptString);
    DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
    MemoryStream mStream = new MemoryStream();
    CryptoStream cStream = new CryptoStream(mStream,DCSP.CreateDecryptor(rgbKey,rgbIV),CryptoStreamMode.Write);
    cStream.Write(inputByteArray,0,inputByteArray.Length);
    cStream.FlushFinalBlock();
    return Encoding.UTF8.GetString(mStream.ToArray());
    }
    catch
    {
    return decryptString;
    }
    } /// <summary>
    /// DES加密文件
    /// </summary>
    /// <param name="inFilePath">待加密文件</param>
    /// <param name="outFilePath">加密后的文件</param>
    /// <param name="encryptKey">加密密钥</param>
    /// <returns></returns>
    public  bool EncryptDES(string inFilePath,string outFilePath,string encryptKey)
    {  
    byte[] rgbIV= Keys;
    try
    {
    byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0,8));
    //读入的流
    FileStream inFs = new FileStream(inFilePath, FileMode.Open, FileAccess.Read);
    //待写的流
    FileStream outFs = new FileStream(outFilePath, FileMode.Create, FileAccess.Write);
    outFs.SetLength(0);
    //创建一个变量来帮助读写
    byte[] byteIn  = new byte[100]; //临时存放读入的流
    long readLen  = 0;              //读入流的长度
    long totalLen = inFs.Length;    //总共读入流的长度
    int  everyLen;                  //每次读入流动长度
    //读入InFs,加密后写入OutFs
    DES des = new DESCryptoServiceProvider();          
    CryptoStream encStream = new CryptoStream(outFs, des.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write); 
    while(readLen < totalLen)
    {
    everyLen = inFs.Read(byteIn, 0, 100);
    encStream.Write(byteIn, 0, everyLen);
    readLen = readLen + everyLen; 
    }
    encStream.Close();  
    outFs.Close();
    inFs.Close();
    return true;//加密成功
    }
    catch(Exception e)
    {
    //AddErrTxt(err.Message);
    return false;//加密失败 
    }
    }
    /// <summary>
    /// DES解密文件
    /// </summary>
    /// <param name="inFilePath">待解密文件</param>
    /// <param name="outFilePath">待加密文件</param>
    /// <param name="decryptKey">解密密钥</param>
    /// <returns></returns>
    public  bool DecryptDES(string inFilePath,string outFilePath,string decryptKey)
    {
    byte[] rgbIV= Keys;
    try
    {
    byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey.Substring(0,8));
    //读入的流
    FileStream inFs = new FileStream(inFilePath, FileMode.Open, FileAccess.Read);
    //待写的流
    FileStream outFs = new FileStream(outFilePath, FileMode.Create, FileAccess.Write);
    outFs.SetLength(0);
    //创建一个变量来帮助读写
    byte[] byteIn  = new byte[100]; //临时存放读入的流
    long readLen  = 0;              //读入流的长度
    long totalLen = inFs.Length;    //总共读入流的长度
    int  everyLen;                  //每次读入流动长度
    //读入InFs,解密后写入OutFs
    DES des = new DESCryptoServiceProvider();          
    CryptoStream encStream = new CryptoStream(outFs, des.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write); 
    while(readLen < totalLen)
    {
    everyLen = inFs.Read(byteIn, 0, 100);
    encStream.Write(byteIn, 0, everyLen);
    readLen = readLen + everyLen; 
    }
    encStream.Close();  
    outFs.Close();
    inFs.Close();
    return true;//解密成功
    }
    catch
    {
    return false;//解密失败 
    }
    }

    }
    }