Security News > 2016 > July > Stealing Money from ISPs Through Premium Rate Calls (Schneier on Security)

I think the best hacks are the ones that are obvious once they're explained, but no one has thought of them before. Here's an example: Instagram ($2000), Google ($0) and Microsoft ($500) were vulnerable to direct money theft via premium phone number calls. They all offer services to supply users with a token via a computer-voiced phone call, but neglected...

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https://www.schneier.com/blog/archives/2016/07/stealing_money_.html