signal爱范儿2026-09-24
Starting with iPhone 18, Apple puts an invisible watermark on your photos
Apple's Reference Image on iPhone 18 Pro and Pro Max uses a sensor-level cryptographic signature to create an invisible, verifiable watermark for photo authenticity. It combines secure digital negatives, trusted timestamps refreshed about every 15 minutes, and Private Cloud Compute to build a tamper-evident chain from capture to final JPEG. A neural network checks for sensor-specific physical traits, and revocation can invalidate photos from compromised sensors.
- for who
- Photographers, journalists, and anyone who needs to prove a photo's authenticity.
- what changes
- They can now verify a photo's origin and integrity without relying on subjective judgment, using an independent cryptographic chain.
- to do
- Enable Reference Image mode on iPhone 18 Pro or Pro Max to sign photos at the moment of capture.
key points
- Apple Reference Image signs photos with a sensor-embedded private key, creating a trust chain.
- Private Cloud Compute processes RAW data after verifying signatures and timestamps.
- A neural network and revocation system guard against sensor compromise and tampering.
#apple#photo authenticity#cryptographic signature#C2PA#ai generated content
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