The White House wants to ‘cryptographically verify’ videos of Joe Biden so viewers don’t mistake them for AI deepfakes::Biden’s AI advisor Ben Buchanan said a method of clearly verifying White House releases is “in the works.”

  • hyperhopper@lemmy.world
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    9 months ago

    I think you are misunderstanding things or don’t know shit about cryptography. Why the fuck are y even talking about publicly unlockable encryption, this is a use case for verification like a MAC signature, not any kind of encryption.

    And no, your process is wild. The actual answer is just replace the sensor input to the same encryption circuits. That is trivial if you own and have control over your own device. For your scheme to work, personal ownership rights would have to be severely hampered.

    • Natanael@slrpnk.net
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      9 months ago

      A MAC is symmetric and can thus only be verified by you or somebody who you trust to not misuse or leak the key. Regular digital signatures is what’s needed here

      You can still use such a signing circuit but treat it as an attestation by the camera’s owner, not as independent proof of authenticity.

      • hyperhopper@lemmy.world
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        9 months ago

        A MAC is symmetric and can thus only be verified by you or somebody who you trust to not misuse or leak the key.

        You sign them against a known public key, so anybody can verify them.

        Regular digital signatures is what’s needed here You can still use such a signing circuit but treat it as an attestation by the camera’s owner, not as independent proof of authenticity.

        If it’s just the cameras owner attesting, then just have them sign it. No need for expensive complicated circuits and regulations forcing these into existence.

    • drathvedro@lemm.ee
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      9 months ago

      I think you are misunderstanding things or don’t know shit about cryptography. Why the fuck are y even talking about publicly unlockable encryption, this is a use case for verification like a MAC signature, not any kind of encryption.

      Calm down. I was just dumbing down public key cryptography for you

      The actual answer is just replace the sensor input to the same encryption circuits

      This will not work. The encryption circuit has to be right inside the CCD, otherwise it will be bypassed just like TPM before 2.0 - by tampering with unencrypted connection in between the sensor and the encryption chip.

      For your scheme to work, personal ownership rights would have to be severely hampered.

      You still don’t understand. It does not hamper with ownership rights or right to repair and you are free to not even use that at all. All this achieves is basically camera manufacturers signing every frame with “Yep, this was filmed with one of our cameras”. You are free to view and even edit the footage as long as you don’t care about this signature. It might not be useful for, say, a movie, but when looking for original, uncut and unedited footage, like, for example, a news report, this’ll be a godsend.

      • Natanael@slrpnk.net
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        9 months ago

        Analog hole, just set up the camera in front of a sufficiently high resolution screen.

        You have to trust the person who owns the camera.

        • drathvedro@lemm.ee
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          9 months ago

          Yes, I’ve mentioned that in the initial comment, and, I gotta confess, I don’t know shit about photography, but to me it sounds like a very non-trivial task to make such shot appear legitimate.