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CTF

Cybersecurity CTF competition writeups.

WTF is CTF?


Currently, I'm on this team. We're an academic team composed of high school seniors & recent graduates.

I specialize in binary exploitation and reverse engineering.

Sometimes I post writups here.



UIUCTF 2017 (April 29-30, 2017)


Crunchtime (300pt)

Programming


decode a dtmf encoding over tcp connection


PACTF 2017 (April 16-30, 2017)


ETA? (60pt)

RE


dynamic analysis to solve non-terminating program

Impossible Conditions (30pt)

RE


modifying program execution to reach alternate code path

PACTF DRM (40pt)

RE


reverse engineer encryption function

Decider (100pt)

RE


reverse engineer multi-step encryption methods in a c++ binary