sample code : import javax.crypto.Cipher; import javax.crypto.spec.SecretKeySpec; import java.nio.charset.StandardCharsets; import java.util.Base64; public class AESEncryptionExample { private static final String ALGORITHM = "AES"; private static final String KEY = "my-secure-key-123"; public static String encrypt(String input) throws Exception { SecretKeySpec keySpec = new SecretKeySpec(KEY.get..