In 2013, a wallet was created secured with a long password generated by the RoboForm password manager. The owner couldn't guess the password he created because he only saw it for a fraction of a second. He only knew what the password consisted of, but he wasn't even sure about it. The wallet was secured with a password generated by the RoboForm program.


However, the old version of RoboForm had a bug that caused passwords to be based on the current time they were generated, making them less random. The owner of the Bitcoins, not remembering exactly when he generated the password, turned to the hacker to crack it. Using a brute force attack, the hacker checked all possible passwords over a specified period of time and discovered that the password was mAIQf0REsR3RRP43UHRx.

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Source: sekurak.pl, youtube.com