using System;
using System.Text;
using System.Security.Cryptography;
class MD5Encrypt
{
    static string Encrypt(string InString)
    {
        MD5CryptoServiceProvider x = new MD5CryptoServiceProvider();
        byte[] bs = Encoding.UTF8.GetBytes(InString);//源字符串转换为字节数组
        bs = x.ComputeHash(bs);//加密返回Hash值数组
        StringBuilder s = new StringBuilder();
        foreach (byte b in bs)//循环生成字符串
        {
            s.Append(b.ToString("x2").ToUpper());
        }
        string ECode = s.ToString();//加密后的字符串
        string E1 = ECode.Substring(0, 3);//前三位
        string E2 = ECode.Substring(3, s.Length-3);
        return E1+"-"+E2;
    }
    static void Main()
    {
        Console.WriteLine(Encrypt("ABCDE"));
        Console.ReadLine();
    }
}