Cybersecurity

 Cybersecurity

Cybersecurity involves protecting computer systems and networks from theft, damage, and unauthorized access. It typically involves using cybersecurity tools and techniques such as firewalls, encryption, and penetration testing to secure software applications.

Example of using encryption to secure sensitive data in Java:

import javax.crypto.Cipher;

import javax.crypto.KeyGenerator;

import javax.crypto.SecretKey;

public class Encryption {

  public static byte[] encrypt(String text) throws Exception {

    // Generate a secret key

    KeyGenerator keyGen = KeyGenerator.getInstance("AES");

    keyGen.init(

SecretKey secretKey = keyGen.generateKey();

// Create a cipher object and initialize it with the secret key

Cipher cipher = Cipher.getInstance("AES");

cipher.init(Cipher.ENCRYPT_MODE, secretKey);

// Encrypt the text

byte[] encryptedText = cipher.doFinal(text.getBytes());

return encryptedText;

}

public static String decrypt(byte[] encryptedText) throws Exception {

// Generate a secret key

KeyGenerator keyGen = KeyGenerator.getInstance("AES");

keyGen.init(128);

SecretKey secretKey = keyGen.generateKey();

// Create a cipher object and initialize it with the secret key

Cipher cipher = Cipher.getInstance("AES");

cipher.init(Cipher.DECRYPT_MODE, secretKey);

// Decrypt the text

byte[] decryptedText = cipher.doFinal(encryptedText);

return new String(decryptedText);

}

public static void main(String[] args) throws Exception {

String text = "secret message";

// Encrypt the text

byte[] encryptedText = encrypt(text);

System.out.println("Encrypted text: " + new String(encryptedText));

// Decrypt the text

String decryptedText = decrypt(encryptedText);

System.out.println("Decrypted text: " + decryptedText);

}

}