$ ctf42

#lattice CTF challenges

17 CTF challenges using lattice from 13 CTFs (2021–2026), 17 with writeups. Mostly Crypto (94%).

Crypto · 16 Misc · 1

Often combined with

#lll 4 #ecdsa 3 #ckks 2 #biased-nonce 2 #lwe 2 #boneh-durfee 1 #rsa 1 #small-private-exponent 1 #commitment-scheme 1 #key-recovery 1 #rlwe 1 #microsoft-seal 1 #approximate-common-divisor 1 #schnorr 1 #nonce-reuse 1

Challenges

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Challenge CTF Weight Category Has
Learning_with_Exploitation TSG 2023 – Crypto files wu 3
small_weiner DaVinciCTF 2022 24.50 Crypto files wu 2
flag_is_win TSG 2021 – Crypto files wu 2
easy_pseudo_random zer0pts 2021 24.56 Crypto files wu 2
insufficient SECCON 2022 Quals 97.90 Crypto files wu 1
snore RaRCTF 2021 24.53 Crypto files wu 1
learning-without-errors DiceCTF 2022 24.82 Crypto files wu 1
Naptime UIUCTF 2024 – Crypto files wu 1
karen zer0pts 2022 35.97 Crypto files wu 1
commitment-issues DiceCTF 2022 24.82 Crypto files wu 1
oneline6ryp7o SekaiCTF 2026 79.25 Crypto files wu 1
Duality TeamItaly 2023 24.88 Crypto files wu 1
Spooky_Safebox Hack.lu 2023 94.73 Crypto files wu 1
the_swirl hxp 2022 – Crypto files wu 1
Vending_Machine PwnMe 2025 Quals 24.95 Crypto files wu 1
Sign_Wars SECCON 2021 – Crypto files wu 1
HEuristic R3CTF 2026 35.95 Misc files wu 1