简单的使用FormsAuthenticationTicket来加密解密

使用下面两个方法可以对字符串实现加密解密，很简单就不多说了。

        /// <summary>
        /// 对字符串进行加密
        /// </summary>
        /// <param name="Passowrd">待加密的字符串</param>
        /// <returns>string</returns>
        public static string Encrypt(string Passowrd)
        {
            string strResult = "";

            FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(Passowrd, true, 2);
            strResult = FormsAuthentication.Encrypt(ticket).ToString();

            return strResult;
        }

        /// <summary>
        /// 对字符串进行解密
        /// </summary>
        /// <param name="Passowrd">已加密的字符串</param>
        /// <returns></returns>
        public static string Decrypt(string Passowrd)
        {
            string strResult = "";

            strResult = FormsAuthentication.Decrypt(Passowrd).Name.ToString();

            return strResult;
        }

这个是实现不可逆加密的，存密码比较适合，也很简单。

        /// <summary>
        /// 对字符串进行加密（不可逆）
        /// </summary>
        /// <param name="Password">要加密的字符串</param>
        /// <param name="Format">加密方式,0 is SHA1,1 is MD5</param>
        /// <returns></returns>
        public static string NoneEncrypt(string Password, int Format)
        {
            string strResult = "";
            switch (Format)
            {
                case 0:
                    strResult = FormsAuthentication.HashPasswordForStoringInConfigFile(Password, "SHA1");
                    break;
                case 1:
                    strResult = FormsAuthentication.HashPasswordForStoringInConfigFile(Password, "MD5");
                    break;
                default:
                    strResult = Password;
                    break;
            }

            return strResult;
        }

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