$ ctf42

#lcg CTF challenges

6 CTF challenges using lcg from 6 CTFs (2021–2025), 6 with writeups. Mostly Crypto (67%) and Reverse (33%).

Crypto · 4 Reverse · 2

Often combined with

#z3-solver 1 #coppersmith 1 #rsa 1 #z3 1 #modulus-recovery 1 #bruteforce 1 #srand-time-seed 1

Challenges

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Challenge CTF Weight Category Has
Entropy BlueHens 2021 22.62 Reverse files wu 2
tadpole corCTF 2022 24.92 Crypto files wu 2
Back_to_the_past PwnMe 2025 Quals 24.95 Reverse files wu 1
BBBB DiceCTF 2023 36.70 Crypto files wu 1
pwgen TAMUctf 2021 – Crypto files wu 1
lcvc HSCTF 2022 – Crypto files wu 1