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A comment on Ask HN: How do I keep child porn out of my site?. Parent comment

Re:Ask HN: How do I keep child porn out of my site? by UserRights on Saturday July 11, 2015 @06:44AM (#9869292)
Why does one need to sign in to azure to help fight CP? Why are the the hashes not available via a public API so that any webmaster could just use it right now? Please explain.
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Re:Ask HN: How do I keep child porn out of my site? by shiggerino on Saturday July 11, 2015 @07:54AM (#9869431)
Why would it even need an API? Just provide the hashes.

What are they afraid of? That "pedophile hackers" will be able to reverse the hashes and get the images?

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Re:Ask HN: How do I keep child porn out of my site? by Spooky23 on Saturday July 11, 2015 @08:39AM (#9869534)
The service is more than a hash matching service. It hashes different regions of the image, allowing it to match images that have been altered.

Authenticating access to the service is desirable for many obvious reasons.

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Re:Ask HN: How do I keep child porn out of my site? by fnordfnordfnord on Saturday July 11, 2015 @11:13AM (#9870036)
>Authenticating access to the service is desirable for many obvious reasons.

Help me out with the obviousness please? Are those reasons more important than deleting child pornography from the web?

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Re:Ask HN: How do I keep child porn out of my site? by Spooky23 on Saturday July 11, 2015 @02:29PM (#9870979)
Off the top of my head: DoS, providing perverts with confirmation that an image is what they want it to be, giving organized groups intel that images are known to law enforcement, etc.
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Re:Ask HN: How do I keep child porn out of my site? by MichaelGG on Saturday July 11, 2015 @12:44PM (#9870450)
Perhaps to avoid people figuring out how to evade it?
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Re:Ask HN: How do I keep child porn out of my site? by shiggerino on Saturday July 11, 2015 @05:40PM (#9871676)
Just compressing the images into an archive, if not encrypting them, is enough to evade such a filter.

There are a lot more legitimate uses for a public repository of CP hashes along with free software for verifying them locally. Not only entrepreneurs and online community operators who don't want the stuff on display, but also users of poorly moderated online communities who don't want the stuff in their browser caches.

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