Apple is giving your photos a tamper-proof seal. Apple It'd be naive to say that we've always been able to trust what we can see, as if seeing something is evidence that it really happened. There's plenty of evidence throughout history of doctored photos, designed to fool the viewer into believing a story.

That said, those skills weren't easily accessible. Now, anybody can create realistic images, or alter photos, just by using their phone. You can't rely on wonky letters or extra fingers to make it obvious, either.

Apple's trying to address this problem with Reference Image mode on the iPhone 18 Pro and Pro Max. The camera creates a protected copy of what it captures, along with evidence of when the photo was taken. When you're ready, Apple's Private Cloud Compute service checks that this record hasn't been tampered with and turns it into a photo with a digital signature that can then be checked to verify its authenticity.

The proof starts inside the camera Apple Adding a digital signature, backed by Apple's own cloud service, is supposed to give you confidence that the finished photo is legitimate. How, though, can you be sure that the signature is legitimate? Apple points out that someone could, theoretically, replace or change a camera's image before it's marked as authentic. Reference Image mode is designed to protect against this by adding its first digital signature inside the camera sensor itself.

The sensor has its own private cryptographic key, which is generated when the phone is manufactured and kept inside it, to create a signature tied to the image data it captures. It's a digital tamper seal. No other phone has that key, and if someone else alters the data, it'll no longer pass the signature check.

Apple certifies the corresponding public key during manufacturing so that its cloud service can verify the sensor's signature. Reference mode is opt-in for the iPhone 18 Pro or Pro Max's main camera, so it won't be enabled by default. To switch it on, you'll need to tap Settings > Camera > Reference Image, then tap Add Reference Mode, before following the on-screen instructions.

To use it, open your camera, then swipe to select Reference Mode. When you take a photo with it switched on, the camera sensor converts the light it captures into digital image data and signs it using its own unique cryptographic key. The mode also stops the sensor's firmware from being able to modify the captured data (again unlikely, but covering another potential area of attack).