[RC3-2017 CTF] Science Class

Writeup by Ninjailbreak

The Mission: This is going to be a great year! Barely five minutes into chemistry and your friend passes you this note inviting you to a party! What do they want you to bring? We easily can recognize the “Periodic Table” in the PDF file, so we combine the table with the PDF and got a list of elements Be, S, Ga, Se, Er. after some combinations we guess the string “BeErGaSeS” [Read More]

[RC3–2017 CTF] knocker

Writeup by WelloWorld

At first, you get an IP and a port – (“”,7747). I first tried to connect it with nc, they wrote that I need to solve their challenge and every challenge is a letter I get with the mission. I saw three types of missions they want me to do: A text of numbers (e.g. “Two thousand, one hundred and seven”) - and I needed to translate it t number (e. [Read More]

[RC3-2017 CTF] Catastrophe

Writeup by WelloWorld

In the beginning, you get a Pcap file that contains 3200 packets of data. The description told us that while one friend went to somewhere and forgot his computer open, his friend took his computer and entered to sites of cat pics. He want to know more about what his friend did and luckily for him, he forgot his Wireshark on. So we know we’re searching for cat pics right now. [Read More]