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The gain is, an Apple user can assume that Apple is not scanning their photo library for csam. Because the only time Apple start scanning is if the device gets

The gain is, an Apple user can assume that Apple is not scanning their photo library for csam. Because the only time Apple start scanning is if the device gets 30 positive hash matches. Where as if they used another service, all their photos will be scanned all the time. There is a clear privacy gain here

smolder 5y ago
You're using the word "scanning" strangely here. Most people would consider the perceptual hash checking of all images to be "scanning".
- onethought 5y ago
  A hash is a string comparison. No details (privacy) are leaked during that comparison. When your phone tells you it only has 1Gb of storage left, do you consider that “on device scanning”?
  - smolder 5y ago
    Checking an image against perceptual hashes is a little more than a string comparison, but that's moot. Also, "scanning" does not require anything be leaked for someone to call it that, which is again, almost definitely what the person you replied to meant when they used the word. Your insistence here that the word doesn't fit that situation is peculiar. Reporting filesystem stats is simply a bad analogy, it's not like checking image contents against perceptual hashes. https://www.thefreedictionary.com/scanning https://www.thefreedictionary.com/scanning 2. [Computers] To search (stored data) automatically for specific data.
simion314 5y ago
Hashes are generated for all images(I think some thumbnail is also generated ), then sent to Apple that checks each hash vs the secret database, the if(matches>=30) code runs on the server too. I would say the scan is on the device and the check is on the server to make sure the secret database of hashes does not get leaked. The image is never encrypted and if FBI (or the corresponding national agency)comes with a warrant your iCloud data will be fully readable.
- onethought 5y ago
  The image is never scanned either, unless you consider generating a hash: scanning. Given hash comparison is how we treat passwords (an extremely sensitive piece of information). I don’t see how anyone can make a compelling case that: generating a hash is an image in some way compromises the privacy of the owner of the image or contents of the image.
  - simion314 5y ago
    >The image is never scanned either, unless you consider generating a hash: scanning. You are a really torturing the language and logic, Example, some malware lists all the files on your system and sends the file names to Disney. Your logic says that is not scanning your devices, it is just listing the file names and your logic implies the scanning happens on Disney server.
    - deleted 5y ago
      [deleted]

smolder 5y ago

You're using the word "scanning" strangely here. Most people would consider the perceptual hash checking of all images to be "scanning".

onethought 5y ago
A hash is a string comparison. No details (privacy) are leaked during that comparison. When your phone tells you it only has 1Gb of storage left, do you consider that “on device scanning”?
- smolder 5y ago
  Checking an image against perceptual hashes is a little more than a string comparison, but that's moot. Also, "scanning" does not require anything be leaked for someone to call it that, which is again, almost definitely what the person you replied to meant when they used the word. Your insistence here that the word doesn't fit that situation is peculiar. Reporting filesystem stats is simply a bad analogy, it's not like checking image contents against perceptual hashes. https://www.thefreedictionary.com/scanning https://www.thefreedictionary.com/scanning 2. [Computers] To search (stored data) automatically for specific data.

simion314 5y ago

Hashes are generated for all images(I think some thumbnail is also generated ), then sent to Apple that checks each hash vs the secret database, the if(matches>=30) code runs on the server too. I would say the scan is on the device and the check is on the server to make sure the secret database of hashes does not get leaked. The image is never encrypted and if FBI (or the corresponding national agency)comes with a warrant your iCloud data will be fully readable.

onethought 5y ago
The image is never scanned either, unless you consider generating a hash: scanning. Given hash comparison is how we treat passwords (an extremely sensitive piece of information). I don’t see how anyone can make a compelling case that: generating a hash is an image in some way compromises the privacy of the owner of the image or contents of the image.
- simion314 5y ago
  >The image is never scanned either, unless you consider generating a hash: scanning. You are a really torturing the language and logic, Example, some malware lists all the files on your system and sends the file names to Disney. Your logic says that is not scanning your devices, it is just listing the file names and your logic implies the scanning happens on Disney server.
  - deleted 5y ago
    [deleted]