assertFalse(isValid, "Tampered data should fail verification");
        }

        @Test
        @DisplayName("Should handle different session keys")
        void testDifferentSessionKeys() throws GeneralSecurityException {
            byte[] sessionKey1 = new byte[16];
            Arrays.fill(sessionKey1, (byte) 0x11);

            byte[] sessionKey2 = new byte[16];