Anyone can compete! No
previous experience
with COBOL is required.


Party Like It's 1959!

with Sam Bowne, Elizabeth Biddlecome,
Irvin Lemus and Kaitlyn Handelman

Final DERPCON Scores

Scoreboard · Submit Flags
Zoom (password: student)


ED 200: Google Cloud Linux Server  15
CBL 1: Basic COBOL  160
CBL 2: String Handling  50
CBL 3: File I/O  25
CBL 4: Tables  110
CBL 5: Subroutines  30
CBL 6: ASCII and Modular Arithmetic  60
CBL 7: RSA Encryption  170
CBL 8: IBM i Server  30
CBL 9: IBM Rational Developer for i  20

Technical References

COBOL Tutorial from JavaTPoint
COBOL Tutorial from TutorialsPoint
GnuCOBOL Manual
GnuCOBOL Sample Programs
GNU COBOL 2.0 Programmer's Guide (PDF)

Cultural References

COBOL-coding volunteers sought
95% of ATM swipes rely on COBOL
Banks scramble to fix old systems
Our Government Runs on COBOL
Is Java the next COBOL?L

Archived Scoreboards

Final DERPCON Scores
Archived Scores Before DERPCON
Final GRIMMCON Scores 4-14-20
Scores Before GRIMMCON


Dear God
What the hell is wrong
with you people, COBOL
I am going to have to
check it out LOL

Boss: What do you think of COBOL?
Me: Fuck COBOL, its why checks
take 3 days to clear the bank.
Boss: Wanna learn COBOL for a CTF?
Me: Hell yes!

Lol cobol CTF? That's like participating
in a CTF that's written in Swahili bro

I'm endeavouring, Ma'am,
to construct a mnemonic
memory circuit using
stone knives and

An elegant weapon
for a more civilized age

The Terminator
runs COBOL


If you are looking
for a job, don't learn

Learn a modern
language like
Python, C++ or Java.

This CTF is intended
only for very
silly people.