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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

#131

Post by [deleted] »

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?

[deleted]

Re: Check if a file was made with Claude

#132

Post by Retr0id »

mrheosuper wrote: post #125
Retr0id wrote: post #91

Earlier quoted context omitted.

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.

Why would I use a camera from Thailand for my forgery?

Re: Check if a file was made with Claude

#133

Post by throwuxiytayq »

mrheosuper wrote: post #124
throwuxiytayq wrote: post #114

Earlier quoted context omitted.

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

Ok, sounds like a watermark of “this post was written by Claude” is sufficient then. Or don’t add any at all - the average joe is that Canadian politician whose speech included “here is a more natural-flowing version of that section that sounds more like legislative speech rather than a series of short points.”

Re: Check if a file was made with Claude

#134

Post by artyomsv »

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.

[dead]

Re: Check if a file was made with Claude

#135

Post by neuroticnews25 »

brianjking wrote: post #123
fn-mote wrote: post #119

Earlier quoted context omitted.

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?

For example if you have 2 equally likely tokens to choose from you can pick the one specified by a key function instead of the one specified by an rng.

Re: Check if a file was made with Claude

#136

Post by ckvibubueu »

sleepybrett wrote: post #102
AmazingTurtle wrote: post #41

Earlier quoted context omitted.

Well, guess they are just trying to conform all the weird EU checkmarks

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

I asked Claude to provide me with a text copy of a website and it said it couldn't because of copyright.

I then gave it the html as a file upload and it gave it back to me.

It's reasoning why? I already had the file so it must be mine. I told it a judge wouldn't care.

Re: Check if a file was made with Claude

#137

Post by DonsDiscountGas »

firefoxd wrote: post #11

This is really fascinating. Even the AI companies have incentives to reject AI generated content. It's like they want you to use AI for everything, but they don't want AI output fed back to them. At work, right after an AI training, we were asked to use our "authentic" voice when writing mid year reviews.

Or maybe it's good for everybody to use LLMs for some things but not other things, as opposed to some people should use it for everything and others for nothing. These companies are definitely using LLMs for coding.

Re: Check if a file was made with Claude

#138

Post by DonsDiscountGas »

qurren wrote: post #64

Up next: 1. Generate a bunch of responses with both Claude and various non-Claude LLMs (ChatGPT, Gemini, Kimi) 2. Train a discriminator model that can differentiate Claude vs. non-Claude 3. Train a de-watermarking model using the discriminator model as loss

You just described how Pangram works.

Re: Check if a file was made with Claude

#140

Post by sig-11 »

ckvibubueu wrote: post #136
sleepybrett wrote: post #102

Earlier quoted context omitted.

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

I asked Claude to provide me with a text copy of a website and it said it couldn't because of copyright. I then gave it the html as a file upload and it gave it back to me. It's reasoning why? I already had the file so it must be mine. I told it a judge wouldn't care.

A judge Wouldn't care because that is not illegal in any way shape or form.
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