Tags: web 

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There is a privacy.txt file (http://ctf.knastu.ru/webch/read?file=privacy.txt). Filename was passed by GET-parameter 'file'. Try to get a file called 'flag.txt': http://ctf.knastu.ru/webch/read?file=flag.txt. Flag is HumanCTF{n0b0dy_r3ad5_privacy}.