A simple questionnaire based challenge on linux basics
A wild goose hunt in a web server
A simulation of time-based side channel attack. Quite interesting.
Reverse engineering a basic binary written in Go
Can you read the stack in runtime
Extracting data from ICMP packets in Packet capture file
A esoteric language based challenge
A troubleshooting challenge for failing SSH logins
QR code insdie a QR code, like a Matryoshka doll