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A comment on Microsoft Bing not only shows child pornography, it suggests it. Parent comment

Re:Microsoft Bing not only shows child pornography, it sugge... by AaronFriel on Thursday January 10, 2019 @04:13PM (#18878239)
They don't just filter their e-mail platforms and consume hash lists from law enforcement agencies. On the contrary, Microsoft funds and freely distributes the most common tool for checking photos (not file hash based, I think proprietary). That's likely the project the employees you mentioned were on, a job I wouldn't wish on anyone I know. I hope they were well supported both while working and afterward.

https://www.microsoft.com/en-us/photodna

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Re:Microsoft Bing not only shows child pornography, it sugge... by vermilingua on Thursday January 10, 2019 @05:56PM (#18879251)
It states immediately below the fold that it uses hash lists.
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Re:Microsoft Bing not only shows child pornography, it sugge... by AaronFriel on Thursday January 10, 2019 @08:00PM (#18880104)
I want to avoid using the term - even though they use it - because it's not a hash function like most people are familiar from computer science. Their "hash" function is resistant to alterations and is more like a "fingerprint".

Edit: to be completely clear, PhotoDNA isn't a cryptographic hash. It's a hash function that maximizes similarity of hashes based on inputs, and is probably closer to a bloom filter in some respects.

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Re:Microsoft Bing not only shows child pornography, it sugge... by throwaway218649 on Thursday January 10, 2019 @09:28PM (#18880545)
These algorithms are called "fuzzy hashing." Examples include "ssdeep," "smapsum," and "nilsimsa."
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Re:Microsoft Bing not only shows child pornography, it sugge... by solarkraft on Friday January 11, 2019 @03:55AM (#18881902)
Is this what I know as 'image hash'?
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