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Cameras that digitally sign pictures have been around for a while. They have also been cracked already (back in 2010: https://www.elcomsoft.com/news/428.html ht
by Tepix 6y ago
Cameras that digitally sign pictures have been around for a while. They have also been cracked already (back in 2010: https://www.elcomsoft.com/news/428.html https://www.elcomsoft.com/news/428.html )
I haven't seen any cameras that digitally sign videos as well. Sounds doable.
However the secret signing key will have to reside inside the camera in a way that a determined attacker cannot extract it. Sounds hard.
- PoignardAzur 6y agoIf we're being serious about cryptography, you could have cameras signing videos in real time with a secret key, in such a way that each camera has an individual key stored in a specialized chip that does the signing, with no way to access the key without breaking the chip's seal. So you could still fake videos, but any accusation of tampering could be verified by checking the seal is intact. (of course you need non-forgeable seals too, but that's comparatively easier)
- drran 6y agoGenerate random key every hour, sign it with previous private key, then delete previous private key.