$ ctf42

#lfsr CTF challenges

8 CTF challenges using lfsr from 6 CTFs (2021–2024), 8 with writeups.

Crypto · 8

Often combined with

#state-recovery 2 #correlation-attack 2 #gf2-linear-system 2 #z3 2 #cows-and-bulls 1 #filtered-lfsr 1 #rejection-sampling 1 #known-plaintext 1 #css-cipher 1 #stream-cipher-cryptanalysis 1

Challenges

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Challenge CTF Weight Category Has
rps_casino
#lfsr#gf2-linear-system#z3#state-recovery
 DiceCTF 2024 Quals 54.40 Crypto files wu 2
Obscurity
#lfsr
 m0leCon 2021 Quals 24.55 Crypto files wu 2
lwsr
#lfsr
 Hack.lu 2021 94.48 Crypto files wu 2
the-other-css
#z3#lfsr#css-cipher
 PlaidCTF 2023 100.00 Crypto files wu 1
zer0lfsr
#lfsr#stream-cipher-cryptanalysis#correlation-attack
 0CTF 2021 Quals – Crypto files wu 1
rejected
#lfsr#rejection-sampling#known-plaintext#gf2-linear-system
 DiceCTF 2022 24.82 Crypto files wu 1
Lockpicking
#lfsr#cows-and-bulls#state-recovery
 DCTF 2021 – Crypto files wu 1
correlated
#lfsr#correlation-attack#filtered-lfsr
 DiceCTF 2022 24.82 Crypto files wu 1