ENCRYPT/DECRYPT

Encryption And Decryption Of Text In Asp.Net
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Introduction:
In this article we will see how to encrypt the messages and again decrypt the encrypted messages. Those days we need more sequrity for hiding our personal messages .Net provide various way to encrypt and again decrypt those messages.
For this purpose I used the  “MD5CryptoServiceProvider” and “TripleDESCryptoServiceProvider” to encrypt our messages. We can easilly use thos hashprovider and convert our messages to unuderstandable format i.e. some encrypted format.
Generally this encryption and decryption is very usefull in storing username and password in encrypted format. Because somebody have access to your server and he can see the user information to restrict those kind of mis use of data while storing we can store the data in encrypted format.After storing encrypted usernames and password while checking the user you can compare the fields each against.

Using Code:
Now we will move to how we can encrypt the message. In my Utility class EncryptyString Method will encrypt the string which will take the message to encrypt and one phassphare as argument and return the encrypted string.

public static string EncryptString(string Message, string Passphrase)
{
byte[] Results;
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();

// Step 1. We hash the passphrase using MD5
// We use the MD5 hash generator as the result is a 128 bit byte array
// which is a valid length for the TripleDES encoder we use below

MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(Passphrase));

// Step 2. Create a new TripleDESCryptoServiceProvider object
TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();

// Step 3. Setup the encoder
TDESAlgorithm.Key = TDESKey;
TDESAlgorithm.Mode = CipherMode.ECB;
TDESAlgorithm.Padding = PaddingMode.PKCS7;

// Step 4. Convert the input string to a byte[]
byte[] DataToEncrypt = UTF8.GetBytes(Message);

// Step 5. Attempt to encrypt the string
try
{
ICryptoTransform Encryptor = TDESAlgorithm.CreateEncryptor();
Results = Encryptor.TransformFinalBlock(DataToEncrypt, 0, DataToEncrypt.Length);
}
finally
{
// Clear the TripleDes and Hashprovider services of any sensitive information
TDESAlgorithm.Clear();
HashProvider.Clear();
}

// Step 6. Return the encrypted string as a base64 encoded string
return Convert.ToBase64String(Results);
}

In the same manner you can decrypt this encrypted string using DecryptString Method which will take decrypted string and passphare as argument and return the plain message i.e. decrypted message.

public static string DecryptString(string Message, string Passphrase)
{
byte[] Results;
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();

// Step 1. We hash the passphrase using MD5
// We use the MD5 hash generator as the result is a 128 bit byte array
// which is a valid length for the TripleDES encoder we use below

MD5CryptoServiceProvider HashProvider = new MD5CryptoServiceProvider();
byte[] TDESKey = HashProvider.ComputeHash(UTF8.GetBytes(Passphrase));

// Step 2. Create a new TripleDESCryptoServiceProvider object
TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();

// Step 3. Setup the decoder
TDESAlgorithm.Key = TDESKey;
TDESAlgorithm.Mode = CipherMode.ECB;
TDESAlgorithm.Padding = PaddingMode.PKCS7;

// Step 4. Convert the input string to a byte[]
byte[] DataToDecrypt = Convert.FromBase64String(Message);

// Step 5. Attempt to decrypt the string
try
{
ICryptoTransform Decryptor = TDESAlgorithm.CreateDecryptor();
Results = Decryptor.TransformFinalBlock(DataToDecrypt, 0, DataToDecrypt.Length);
}
finally
{
// Clear the TripleDes and Hashprovider services of any sensitive information
TDESAlgorithm.Clear();
HashProvider.Clear();
}

// Step 6. Return the decrypted string in UTF8 format
return UTF8.GetString(Results);
}

Conclusion:
Using those hash provider classes of .Net you can encrypt and again decrypt the messages.

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