assertFalse(tamperedResult, "Tampered data MUST return false even with valid signature format");
        }

        @Test
        @DisplayName("Should handle offset correctly in verify")
        void testVerifyWithOffset() throws Exception {
            byte[] largeData = new byte[256];
            int offset = 64;
            Arrays.fill(largeData, (byte) 0x00);

            // Set signed flag at correct offset