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Turn On Advanced Data Protection
- Enable Advanced Data Protection to end-to-end encrypt most iCloud data except mail, contacts, and calendars.
- Set a recovery key or a trusted recovery contact when you enable it to avoid data loss.
Metadata And Checksums Still Expose Info
- Apple keeps some metadata under standard protection even with Advanced Data Protection enabled.
- They use checksums and de-duplication techniques that can reveal whether another account has the same file.
Checksums Differ From Perceptual CSAM Hashes
- Raw byte checksums differ from perceptual hashes used for CSAM detection, so raw checksums alone make CSAM scanning harder.
- Apple saved raw checksums, which don't detect modified images like perceptual-hash systems do.