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Re:Hack-petya mission accomplished – Petya ransomware decryptor by biot on Monday April 11, 2016 @06:27PM (#11475657)
To add to the suppositions: perhaps the author was afraid they may get bitten by their own malware and designed in a weakness as a backdoor in case they lost access to the key server and needed to decrypt their own drive.
Re:Hack-petya mission accomplished – Petya ransomware decryptor by kobayashi on Monday April 11, 2016 @07:50PM (#11476103)
This is my favourite of all the answers, because it would mean that the dev would have known how incompetent s/he was, and thus made a weak system in order to account for the likelihood of a "self-inflicted wound".