c#文本加密程序代码示例

控件滚动方法：

复制代码 代码如下:
//具体方法
//Movegroup(string u, Panel p1, Panel p2)
//Movegroup(方向<或>,被移走的控件,被移入的控件)
//注意还要添加两个timer ：Return，Next ， Interval = 10
        public void Movegroup(string u, Panel p1, Panel p2)
        {
            if (u == ">")     //这是向右，
            {
                up1 = p1;
                up2 = p2;
                p2.Visible = true;
                p1.Enabled = false;
                p2.Enabled = false;
                Next.Enabled = true;
            }
            if (u == "<")
            {
                up1 = p1;
                up2 = p2;
                p2.Visible = true;
                p1.Enabled = false;
                p2.Enabled = false;
                Return.Enabled = true;
            }
        }
        Panel up1, up2;
        int a = 0;
        int b = -580;
        int i = 0;
        int j = 580;
        private void Next_Tick(object sender, EventArgs e)
        {
            i -= 30;
            j -= 30;
            up1.Location = new Point(i, up1.Location.Y);
            up2.Location = new Point(j, up2.Location.Y);
            if (i <= -580 || j <= 0)
            {
                Next.Enabled = false;
                up2.Enabled = true;
                up1.Enabled = false;
                up1.Visible = false;
                i = 0;
                j = 580;
            }
        }
        private void Return_Tick(object sender, EventArgs e)
        {
            a += 30;
            b += 30;
            up1.Location = new Point(a, up1.Location.Y);
            up2.Location = new Point(b, up2.Location.Y);
            if (a >= 580 || b >= 0)
            {
                Return.Enabled = false;
                up2.Enabled = true;
                up1.Visible = false;
                up1.Enabled = false;
                a = 0;
                b = -580;
            }
        }

加密原理：

密码+问题+答案的md5 +“/”+加密后的串 组成一个文本文件，（二进制更好了）

解密原理：

先分离出文件里的 密码+问题+答案的md5在与用户输入的密码+问题+答案的md5对比

如果相符则 以此密码解密文件

如果不相符则 提示密码问题及答案错误

我使用DES加密，这是一个类

复制代码 代码如下:
namespace Pd_kernel
{
    public class Encrypt
    {
        ///

        /// 进行DES加密。
        ///

        /// 要加密的字符串。
        /// 密钥，且必须为8位。
        /// 以base64格式返回的加密字符串。
        public static string DESEncrypt(string pToEncrypt, string sKey)
        {
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                byte[] inputByteArray = Encoding.UTF8.GetBytes(pToEncrypt);
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Convert.Tobase64String(ms.ToArray());
                ms.Close();
                return str;
            }
        }

        ///

        /// 进行DES解密。
        ///

        /// 要解密的以base64
        /// 密钥，且必须为8位。
        /// 已解密的字符串。
        public static string DESDecrypt(string pToDecrypt, string sKey)
        {
            byte[] inputByteArray = Convert.Frombase64String(pToDecrypt);
            using (DESCryptoServiceProvider des = new DESCryptoServiceProvider())
            {
                des.Key = ASCIIEncoding.ASCII.GetBytes(sKey);
                des.IV = ASCIIEncoding.ASCII.GetBytes(sKey);
                System.IO.MemoryStream ms = new System.IO.MemoryStream();
                using (CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write))
                {
                    cs.Write(inputByteArray, 0, inputByteArray.Length);
                    cs.FlushFinalBlock();
                    cs.Close();
                }
                string str = Encoding.UTF8.GetString(ms.ToArray());
                ms.Close();
                return str;
            }
        }

        public static string MD5encrypt(string text, string method)
        {
            string strMD5 = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(text, method);
            return strMD5;
        }
    }
}