Here is my collection of CTF writeups for challenges I’ve solved, mostly while on the club.eh team.
Blinkenlights 0 - Hacker's Odyssey CTF
Link to archived challenge Category Difficulty Solves Author forensics medium 10 Artemis Description We found some microcontrollers the hackers were using to send each other secret messages. I wonder what this one says? The lights seem to alternate in colour. Note: there are two versions of the exact same recording. One is in grayscale (-gray), the other in full RGB. You only need one to solve the challenge. Players are given two files to download: blinkenlights-0....
Blinkenlights 1 - Hacker's Odyssey CTF
Link to archived challenge Category Difficulty Solves Author forensics medium 10 Artemis Description Here is another one of the microcontrollers used by t3l0s to send secret messages. This pattern is different. Could you help me decode it? Flag format: clubeh{<recovered_text>} Note: there are two versions of the exact same recording. One is in grayscale (-gray), the other in full RGB. You only need one to solve the challenge. Players are given two files to download: blinkenlights-1....
Blinkenlights 2 - Hacker's Odyssey CTF
Link to archived challenge Category Difficulty Solves Author forensics hard 0 Artemis Description This is the last t3l0s microcontroller we found containing secret messages. We have no idea what’s going on with this one. Good luck. Note: there are two versions of the exact same recording. One is in grayscale (-gray), the other in full RGB. You only need one to solve the challenge. Players are given two files to download: blinkenlights-2....
secretman - Hacker's Odyssey CTF
Link to archived challenge Category Difficulty Solves Author reverse medium 8 tetratarius Description We’ve found what we suspect to be one of the hacker’s programs for storing secrets, we believe that a secret key is hidden within the program. Players are given a file to download: secretman.pyc. There are also two hints available: Look up what a .pyc file is. Look up how to reverse engineer a .pyc file. Analysis First, let’s run file secretman....
Asimov's Second Law - Hacker's Odyssey CTF
Link to archived challenge Category Difficulty Solves Author web easy 22 sudoBash418 Description Our playtesters said this challenge is so easy, even Googlebot could solve it. So I made some tweaks to ensure Googlebot doesn’t stand a chance. Players are given a link to a website (now offline). There is also a single hint available: What part of a website does Googlebot visit first? Analysis Clicking on the link brings us to a barebones webpage with the following message:...