How to : Encrypt and Decrypt string using Asp.net

Introduction

Many time we need to encrypt and decrypt values to send over the query sting  and prevent the attacks.


below are the function we can use to accomplish those task

need to add namespace as below

using System.Security.Cryptography;

public static string EncryptText(string Text)
        {
            string Key = "@()$*#-=1";
            return Encrypt(Text, Key);
        }
        public static string DecryptText(string Text)
        {
            string Key = "@()$*#-=1";
            return Decrypt(Text, Key);
        }
        private static string Encrypt(string strText, string strEncrKey)
        {
            byte[] byKey = { };
            byte[] IV = { 18, 52, 86, 120, 144, 171, 205, 239 };

            byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0, 8));
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            byte[] inputByteArray = Encoding.UTF8.GetBytes(strText);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            return Convert.ToBase64String(ms.ToArray());



        }
        private static string Decrypt(string strText, string sDecrKey)
        {
            byte[] byKey = { };
            byte[] IV = { 18, 52, 86, 120, 144, 171, 205, 239 };
            byte[] inputByteArray = new byte[strText.Length + 1];

            byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0, 8));
            DESCryptoServiceProvider des = new DESCryptoServiceProvider();
            inputByteArray = Convert.FromBase64String(strText);
            MemoryStream ms = new MemoryStream();
            CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write);
            cs.Write(inputByteArray, 0, inputByteArray.Length);
            cs.FlushFinalBlock();
            System.Text.Encoding encoding = System.Text.Encoding.UTF8;
            return encoding.GetString(ms.ToArray());

        }

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