// Clean up
        Arrays.fill(plaintext, '\0');
        Arrays.fill(decrypted, '\0');
    }

    @Test
    public void testDecryptWithTamperedData() throws Exception {
        char[] plaintext = "SecureData".toCharArray();
        byte[] encrypted = storage.encryptCredentials(plaintext);

        // Tamper with the encrypted data
        encrypted[encrypted.length - 1] ^= 0xFF;