$ ctf42

Challenges

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

38 challenges · browse all techniques

Challenge CTF Weight Category Has
Art_Class
#maritime-signal-flags#visual-decoding
 UMDCTF 2021 – Crypto files wu 2
Cards_Galore
#mirdek-cipher#caesar-cipher
 UMDCTF 2021 – Crypto files wu 2
Celebration
#dancing-men-cipher#substitution-cipher
 UMDCTF 2021 – Crypto files wu 2
Office_Secrets
#rsa#common-modulus-attack
 UMDCTF 2021 – Crypto files wu 1
Subway
#substitution-cipher
 UMDCTF 2021 – Crypto files wu 1
To_Be_Xor_Not_To_Be
#xor
 UMDCTF 2021 – Crypto files wu 1
Whose_Base_Is_It_Anyway
#base-conversion
 UMDCTF 2021 – Crypto files wu 2
no_brainrot_allowed UMDCTF 2026 – Crypto files
weave UMDCTF 2026 – Crypto files
Key_Recovery UMDCTF 2024 – Crypto files
Triple_DES UMDCTF 2024 – Crypto files
giedi_composite UMDCTF 2024 – Crypto files
haes UMDCTF 2024 – Crypto files
haes_2 UMDCTF 2024 – Crypto files
padding_oracle UMDCTF 2024 – Crypto files
AES-TR UMDCTF 2023 – Crypto files
AdiShamir UMDCTF 2023 – Crypto files
Bulbeuler UMDCTF 2023 – Crypto files
CBC-MAC1 UMDCTF 2023 – Crypto files
CBC-MAC2 UMDCTF 2023 – Crypto files
Caterpie UMDCTF 2023 – Crypto files
Eeveelutions UMDCTF 2023 – Crypto files
Ekans UMDCTF 2023 – Crypto files
HiddenMessage UMDCTF 2023 – Crypto files
NoisyBits UMDCTF 2023 – Crypto files
ReduceThyself UMDCTF 2023 – Crypto files
pokecomms UMDCTF 2023 – Crypto files
DFASpeck1 UMDCTF 2022 – Crypto files
DFASpeck2 UMDCTF 2022 – Crypto files
DFA_AES UMDCTF 2022 – Crypto files
MTP UMDCTF 2022 – Crypto files
Squarsa UMDCTF 2022 – Crypto files
VigenereXOR UMDCTF 2022 – Crypto files
Card_Obsession UMDCTF 2021 – Crypto files
Computer_Troubles UMDCTF 2021 – Crypto files
Freddie_Files UMDCTF 2021 – Crypto files
Travel_in_Layers UMDCTF 2021 – Crypto files
crypto UMDCTF 2020 – Crypto files