DES解密，ECB模式，PKCS7填充标准

最近工作中用到了des解密，之前没接触过，花了点时间去研究了一下，des算是比较基础的加密方式了，这边主要讲的是ECB模式，ECB模式作为一种基本工作模式，具有操作简单，易于实现的特点。同时由于其分组的独立性，利于实现并行处理，并且能很好地防止误差传播。个人觉得ECB比较适用于密钥保护。代码如下：

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public class DesHelper
    {
        private static String _ConstValue = "12345678";
        public static String Decipher(String Str, bool IncludeLocalInfo)
        {
            if (null == Str || 0 == Str.Length) return "";
            try
            {
                SymmetricAlgorithm sa = new DESCryptoServiceProvider();
                String _Key = _ConstValue;
                sa.Key = Encoding.UTF8.GetBytes(_Key);
                sa.IV = Encoding.UTF8.GetBytes(_ConstValue);
                sa.Mode = System.Security.Cryptography.CipherMode.ECB;
                sa.Padding = PaddingMode.PKCS7;
                 ICryptoTransform ct = sa.CreateDecryptor();
                byte[] byt = Convert.FromBase64String(Str);
                MemoryStream ms = new MemoryStream();
                CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);
                cs.Write(byt, 0, byt.Length);
                cs.FlushFinalBlock();
                cs.Close();
                return Encoding.UTF8.GetString(ms.ToArray());
            }
            catch(Exception e) {

            }
            return "";
        }
    }

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没错，代码就是如此简单