Extra Credit


CSE 365 - Fall 2026.

This module contains optional extra credit challenges for CSE 365.

Each regular course module has three extra credit challenges: Easy, Medium, and Hard.

🚨 Required for Extra Credit 🚨

Solving a challenge alone does not earn credit. After every extra credit challenge you complete, you must SUBMIT THE REQUIRED CTF ARCHIVE CHALLENGE REFLECTION to receive any points.

Each reflection should take about 5 minutes and briefly describe what you did and what you learned.

Regular coursework offers up to 840 points against the course's 800-point baseline, or 105%. The Extra Credit module offers up to 40 additional credited points, bringing the maximum to 880/800 points, or 110%. More than 40 points of extra credit challenges are available for flexibility, but only 40 points may count toward your final grade. See the syllabus for more details.



Module 1: Linux Luminarium & Access Control

hello guys, I started this new service check note.txt file for a sanity check.

Author: xor and the half adder

My friend gave me some fancy text, but it was reversed, and so I tried to reverse it but I think I messed it up further. Can you find out what the text says?

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: HSN CS Club

One of these is not like the others.

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: JoshDaBosh


Module 2: Dealing with Data, Talking Web & SQL

Decode using hex and see what you get...
6236343a20615735305a584a755a58526659323975646d567963326c76626c3930623239736331397962324e72

Use flagCheck to input the flag you get from the challenge to get the actual flag

If you need hint than cat /challenge/hint.txt

Author: angstromctf team

The amoeba is a fascinating creature.

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: angstromctf team

Encoding is not encryption, but what if I just encode the flag with base16,32,64? If I encode my precious flag for 150 times, surely no one will be able to decode it, right?

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: Sunggwan Choi


Module 3: Web Security


Module 4: Computing 101


Module 5: Reverse Engineering


Module 6: Binary Exploitation


Module 7: Intercepting Communications


Module 8: Cryptography


30-Day Scoreboard:

This scoreboard reflects solves for challenges in this module after the module launched in this dojo.

7-Day | 30-Day | All-Time

Hackers Crews
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