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by anowlcalledjosh 2949 days ago
Sadly no detail on how to find the keys, which is the hard bit.

Vulnerabilities in the protocol make it relatively trivial to discover the keys if you have the correct hardware (e.g. a Proxmark3), but as far as I know nobody has done this with a phone – all these writeups conveniently only clone tags with keys in the list of common keys distributed with MifareClassicTool.