How to Encrypt and Decrypt Data In Java Using DES Algorithm

//How to Encrypt and Decrypt Data In Java Using DES Algorithm

Here are the general steps to encrypt/decrypt a file in Java:

Create a Key from a given byte array for a given algorithm.

Get an instance of Cipher class for a given algorithm transformation. See document of the Cipher class for more information regarding supported algorithms and transformations.

Initialize the Cipher with an appropriate mode (encrypt or decrypt) and the given Key.

Invoke doFinal(input_bytes) method of the Cipher class to perform encryption or decryption on the input_bytes, which returns an encrypted or decrypted byte array.

Read an input file to a byte array and write the encrypted/decrypted byte array to an output file accordingly.

Now, let’s see some real examples.

=============================================================
class Desal
{
public static void main(String []s)
{

try
{
String st="Hello";


//ENCRYPT_MODE


//DECRYPT_MODE

}
catch(Exception e)
{
}
}
}

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