Are there any opsec or privacy concerns with C2PA Content Credentials? It seems like the Pixel 10 will automatically attach this data into every JPEG taken.
Google did promise that this feature functions entirely offline and will not lead to deanonymization. More details here:
Google says the system works offline, is secure from external interference throughout the process, and does not threaten the user’s anonymity while retaining its verifiability.
The tech giant outlines several layers of security and integrity guarantees it infused into the Content Credentials system to make it tamper-resistant and trustworthy, including:
- Cryptographic signing that invalidates the digital signature when the metadata is modified.
- Tamper-resistant key storage, with all cryptographic keys generated and stored in Android StrongBox inside the Titan M2 security chip.
- Android Key Attestation, which enables Google’s C2PA Certification Authorities to verify the authenticity of both the hardware and the app requesting the credential.
- One-time-use keys per image, meaning each photo is signed with a unique cryptographic key that is never reused, preserving the user’s privacy and anonymity.
- On-device trusted timestamps, supported by a secure internal clock maintained by the Tensor chip, which allows Pixel devices to attach verifiable timestamps even when offline.