how to encrypt and decrypt ?

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Hi,
I am creating a create_user page and an user_login page using asp.net. I am trying to encrypt the password during creating the user(insert password into table) and decrypt the password during login(retrive password from table).
Will you pls help me in encrypting and decrypting the password ?

Posted 16-Oct-12 18:27pm

NayakMamuni

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barneyman · Answer 1 · 2012-10-16T20:17:00

While the two solutions you have been given are what you asked for, please don't use this approach

It's much more secure to store a hash of the password at the server end, than any symmetrically encrypted alternative

When the password is created, the server stores a hash
When the password is entered for authentication, only the hash is sent to the server for comparison

The Key to a Secure Password[^]

Divya RS · Answer 2 · 2012-10-16T19:07:00

Solution 2

Refer this Link[^]

Posted 16-Oct-12 19:07pm

Divya RS

Ajay J Singh · Answer 3 · 2012-10-16T18:59:00

C#

using System.Security.Cryptography;

public static string Encrypt(string strEncrypt)
        {
            byte[] keyArray;
            byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(strEncrypt);

            if (true)
            {
                MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes("123"));
            }
            else
                keyArray = UTF8Encoding.UTF8.GetBytes("123");

            TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
            tdes.Key = keyArray;
            tdes.Mode = CipherMode.ECB;
            tdes.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = tdes.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return Convert.ToBase64String(resultArray, 0, resultArray.Length);
        }

        public static string Decrypt(string strDecrypt)
        {
            byte[] keyArray;
            byte[] toEncryptArray = Convert.FromBase64String(strDecrypt);

            if (true)
            {
                MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
                keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes("123"));
            }
            else
                keyArray = UTF8Encoding.UTF8.GetBytes("123");

            TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
            tdes.Key = keyArray;
            tdes.Mode = CipherMode.ECB;
            tdes.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = tdes.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return UTF8Encoding.UTF8.GetString(resultArray);
        }

how to encrypt and decrypt ?

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