Somebody at Facebook will be "reviewing" the photos.

According to Facebook, the review will be carried out by one specifically trained member of their community operations safety team; however, the post doesn't describe what their training will consist of, or what the review will entail.

Let's hope this one person doesn't get overwhelmed "reviewing" thousands of nudes per day, or ever take a day off, or ever go on vacation.

Facebook says they will protect users by "hashing" the photos to create a unique "fingerprint".  Then, if an ex-partner tries to upload the photo for revenge, the system will detect the matching "hash" and prevent the upload.

Sounds good, right?  What could go wrong?  Let's do some math...

Photos taken with an iPhone 6 are 3264 x 2448, or 7,745,472 pixels.  There are 24 bits in 1 pixel, so we're talking about 185,891,328 bits in one photo.

IF EVEN 1 OF THOSE 185,891,328 BITS HAS BEEN ALTERED, THE HASH OF THE 2 PHOTOS WILL NOT MATCH AND UPLOAD OF THE PHOTO WOULD NOT BE BLOCKED.

Let's test it with a tiny photo containing only 7600 pixels, 1000x fewer pixels than the typical iPhone image:

   hash = 3f4ed12cfb96e07b4d4e26bdff734ec5ce783325


   hash = 3cf29540a38b64cf35b72006946ac5ba0fa421a3

Can you tell the difference between the 2 pictures?  Me, neither.
Yet nothing would prevent someone from uploading the 2nd photo even if the first photo was blocked.

Nice try, Pervbook.

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