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Check if a file was made with Claude

claude.com

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Re: Check if a file was made with Claude

#121

Post by panarky »

Retr0id wrote: post #109
panarky wrote: post #96

Earlier quoted context omitted.

Just because you can imagine how a thing could theoretically be broken does not make it broken. It's like saying a prisoner has the same freedoms as everyone else because he could theoretically escape.

It's not a theory, I've done it. Here's a cryptographically signed + timestamped photo of me winning the lottery: https://verify.contentauthenticity.org/?source=https%3A%2F%2... Would you like to buy my winning ticket from me? (Compare against winning numbers and draw timestamp at https://www.euro-millions.com/results/28-08-2026 )

Prisoners escaping from prison is not a theory either, prisoners have actually escaped. Does that mean all prisoners are free?

Re: Check if a file was made with Claude

#123

Post by brianjking »

fn-mote wrote: post #119
sleepybrett wrote: post #102

Earlier quoted context omitted.

I'm not sure that 'preventing ai-generated fraud' is really a 'weird checkmark'

If watermarking of any kind were actually going to prevent ai-generated “fraud” (or even ai being used as part of a scam), it would have more support on HN. This kind of metadata injection increases surveillance without providing a meaningful deterrent.

Furthermore, it almost surely limits the quality of the output. At least the finterprinting of the text tokens has to, how can you otherwise constrain token output?

Re: Check if a file was made with Claude

#124

Post by mrheosuper »

throwuxiytayq wrote: post #114
chrisra wrote: post #113

Earlier quoted context omitted.

Maybe this is silly: what about zero-width spaces or other hidden characters? Add them in post-processing, and the response quality doesn't degrade (though rendering etc. might be wonky).

Yes, it is silly. Stripping these is about as trivial as removing "this post was written by Claude" appended in plaintext. You could make a clipboard monitor that does this as soon as you CTRL+C, it's a 1-shot prompt. Not to mention that these wonky Unicode chars will break in every other program. Stripping Anthropic's watermarking, however, is more difficult - probably about 2 prompts.

But your average joe won't "setup custom clipboard monitor to auto clip out whitespace". That's why Gemini still include its logo into generated picture even if it's trivial to crop it out

Re: Check if a file was made with Claude

#125

Post by mrheosuper »

Retr0id wrote: post #91
panarky wrote: post #89

Earlier quoted context omitted.

C2PA cryptographically guarantees that the bytes came from a hardware/software signer and that the signed payload has not been modified since that signature was applied. So no, C2PA is not as easy to spoof as EXIF. And no, the existence of DRM doesn't validate the integrity or the provenance of the bytes.

And what happens when someone tells the hardware signer to sign the bytes of a fake image? What happens when someone extracts the signing key? The presence of cryptography doesn't magically make something trustworthy.

I assume the signing key is different from each camera unit(not only model), so if a picture of you winning lottery in US capture by a camera sold to someone in Thailand, it would be extreme unlikely to be real.

Re: Check if a file was made with Claude

#126

Post by hugo1789 »

chrisra wrote: post #113
AareyBaba wrote: post #103

Earlier quoted context omitted.

Text watermarking will surely cause a degradation in quality writing. There's is no text watermarking that doesn't cause a decline in writing quality. Writing quality will surely deteriorate if text watermarking is implemented.

Maybe this is silly: what about zero-width spaces or other hidden characters? Add them in post-processing, and the response quality doesn't degrade (though rendering etc. might be wonky).

That would be so much worse. Code written that doesn't work, SQL that couldn't be parsed, ...

Re: Check if a file was made with Claude

#128

Post by port443 »

panarky wrote: post #121
Retr0id wrote: post #109

Earlier quoted context omitted.

It's not a theory, I've done it. Here's a cryptographically signed + timestamped photo of me winning the lottery: https://verify.contentauthenticity.org/?source=https%3A%2F%2... Would you like to buy my winning ticket from me? (Compare against winning numbers and draw timestamp at https://www.euro-millions.com/results/28-08-2026 )

Prisoners escaping from prison is not a theory either, prisoners have actually escaped. Does that mean all prisoners are free?

This is a terrible analogy.

In cryptography, once any SINGLE person in the world has compromised a signing key, EVERY person in the world can use it.

Thus for a prisoner analogy, its equivalent to say once any SINGLE prisoner escapes, EVERY prisoner has the ability to escape.

So yes, in this terrible analogy it means all prisoners are free.

Re: Check if a file was made with Claude

#129

Post by borschtplease »

dgellow wrote: post #43

> Knowing where content came from, and whether AI was involved, makes it easier to trust what you see online. That’s a cute way to imply their service is used to generate misinformation. They are basically saying to not trust the AI content made from their own product :)

Like they should ban astronaut on a horse images or what? Misinformation becomes misinformation upon the fact of presenting it as so, not the fact of creation

Re: Check if a file was made with Claude

#130

Post by Lockal »

rcktmrtn wrote: post #76
hughw wrote: post #65

Earlier quoted context omitted.

Or just write a 6 line program to remove the metainfo from the file?

Your observation is sharp, but it's not just metainfo—it's load-bearing text. To remove it, you need to delve deep and alter the tapestry of carefully selected words. edit: almost forgot the "—"

s/text/prose/ s/'/’/

The honest seam is obvious: claudish works; imitation does not. That’s not nothing.

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