assertArrayEquals(key2, retrieved2, "Key 2 should match");
        assertFalse(Arrays.equals(retrieved1, retrieved2), "Keys should be different");
    }

    @Test
    public void testClearAllKeys() {
        // Store multiple keys
        for (int i = 0; i < 5; i++) {
            byte[] key = new byte[16];
            new SecureRandom().nextBytes(key);