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Bleeping Computer [bleepingcomputer.com] has a translation of a message from the arrestee:
I am an 18-year-old, now middle school graduate. Perhaps that which differs from the average, is that I trust that I can help solve a mistake.
I discovered last Friday that I could take a monthly ticket for 50 for the new internet e-ticket system in BKK, and then informed them about two minutes later. I did not use the ticket, I do not even live near Budapest, I never traveled on a BKK route. My goal was just to signal the error to the BKK in order to solve it and not to use it (for example, to sell the tickets at a half price for their own benefit).
The BKK has not been able to answer me for four days, but in their press conference today they said it was a cyber attack and was reported. I found an amateur bug that could be exploited by many people - no one seriously thinks an 18-year-old kid would have played a serious security system and wanted to commit a crime by promptly telling the authorities.
I am convinced that if I do not speak about the error, I will not report it. My hire was canceled only after I sent my letter to them.
I would like to publish this post without my name and identity. I ask you to help by sharing this entry with your acquaintances so that the BKK will come to a better understanding and see if my purpose is merely a helper intention, I have not harmed or wanted to harm them in any way. I hope that in this case the BKK will consider withdrawing the report