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On the other hand, Google can run arbitrary queries over your data (published to their cloud) while Apple uses the same algorithm and hash database for everyone
by aj3 5y ago
On the other hand, Google can run arbitrary queries over your data (published to their cloud) while Apple uses the same algorithm and hash database for everyone (which probably will get reverse engineered and audited by next BlackHat).
- michaelmrose 5y agoYou can't realistically reverse engineer a hash to source image.
- aj3 5y ago1. Previous submission (http://www.hackerfactor.com/blog/ http://www.hackerfactor.com/blog/) claims that PhotoDNA is reversible to 26x26 grayscale 2. What’s more important is you can reverse engineer algorithm that’s used locally to compare these hashes. Unlike with cloud-based searches other providers run, this puts significant limitations to what Apple or LEA can do on your phone. E.g. they can’t extract strings from PDF or grep through image metadata or request all images of certain users without knowing what these images would depict in advance. The frequency of hash database updates even if opaque will still provide more insight into what is being searched for compared to current status quo where public has zero insights because all search / aggregation queries are run on the server.
- jdiez17 5y agoWhat makes you think that Apple will use the same database for everyone?