$ ctf42

Challenges

Category
Difficulty
CTFtime weight
–
Higher weight ≈ harder, more prestigious event.
Year
–
Must have
Reset

56 challenges · browse all techniques

Challenge CTF Weight Category Has
cheap_logs
#use-after-free (uaf)
 DownUnderCTF 2025 91.66 Crypto files wu 1
my_array_generator
#keystream-recovery
 DownUnderCTF 2024 68.04 Crypto files src wu 1
shufflebox
#permutation
 DownUnderCTF 2024 68.04 Crypto files src wu 1
baby-arx
#byte-at-a-time
 DownUnderCTF 2022 – Crypto files src wu 3
Break_Me
#ecb-oracle
 DownUnderCTF 2021 – Crypto files wu 3
Substitution_Cipher_I
#substitution-cipher
 DownUnderCTF 2021 – Crypto files src wu 3
Substitution_Cipher_II
#lagrange-interpolation
 DownUnderCTF 2021 – Crypto files wu 1
treasure
#shamir-secret-sharing
 DownUnderCTF 2021 – Crypto files wu 1
yadlp
#discrete-log
 DownUnderCTF 2021 – Crypto files wu 1
Speak_Friend_and_Enter DownUnderCTF 2025 91.66 Crypto files src wu 1
flag_art DownUnderCTF 2023 46.63 Crypto files wu 1
SH_RSA DownUnderCTF 2025 91.66 Crypto files src
certvalidated DownUnderCTF 2025 91.66 Crypto files
good_game_spawn_point DownUnderCTF 2025 91.66 Crypto files src
good_game_well_played DownUnderCTF 2025 91.66 Crypto files
hungry-hungry-caterpillar DownUnderCTF 2025 91.66 Crypto files src
yet_another_login DownUnderCTF 2025 91.66 Crypto files src
AES DownUnderCTF 2024 68.04 Crypto files
Poly1305_OTM DownUnderCTF 2024 68.04 Crypto files
V_for_Vieta DownUnderCTF 2024 68.04 Crypto files
decrypt_then_eval DownUnderCTF 2024 68.04 Crypto files
kyber_decryption_oracle DownUnderCTF 2024 68.04 Crypto files
super_party_computation DownUnderCTF 2024 68.04 Crypto files
three_line DownUnderCTF 2024 68.04 Crypto files
apbq_rsa_i DownUnderCTF 2023 46.63 Crypto files
apbq_rsa_ii DownUnderCTF 2023 46.63 Crypto files
complementary DownUnderCTF 2023 46.63 Crypto files
dilithium DownUnderCTF 2023 46.63 Crypto files
encrypted_mail DownUnderCTF 2023 46.63 Crypto files
fnv DownUnderCTF 2023 46.63 Crypto files
handshake DownUnderCTF 2023 46.63 Crypto files
hhhhh DownUnderCTF 2023 46.63 Crypto files
lcg_card_gimmicks DownUnderCTF 2023 46.63 Crypto files
randomly_chosen DownUnderCTF 2023 46.63 Crypto files
1337crypt-v3 DownUnderCTF 2022 – Crypto files
cheap-ring-theory DownUnderCTF 2022 – Crypto files
faulty-arx DownUnderCTF 2022 – Crypto files
kyber DownUnderCTF 2022 – Crypto files
oracle-for-block-cipher-enthusiasts DownUnderCTF 2022 – Crypto files src
rsa-interval-oracle-i DownUnderCTF 2022 – Crypto files src