$ ctf42

Challenges

Category
Difficulty
CTFtime weight
–
Higher weight ≈ harder, more prestigious event.
Year
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23 challenges · browse all techniques

Challenge CTF Weight Category Has
The_Accursed_Lego_Bin
#rsa#low-public-exponent#prng-seed-recovery
 UMassCTF 2026 65.95 Crypto files wu 1
Third_Times_the_Charm
#rsa#hastad-broadcast#crt
 UMassCTF 2024 43.10 Crypto files wu 2
hatmash
#matrix#custom-hash#linear-algebra
 UMassCTF 2022 23.56 Crypto files wu 1
malware
#aes-ctr#known-plaintext#keystream-reuse
 UMassCTF 2021 23.56 Crypto files wu 3
B4_the_B8 UMassCTF 2024 43.10 Crypto files wu 1
Reader_Exercise UMassCTF 2024 43.10 Crypto files wu 1
Shuffling_as_a_Service UMassCTF 2024 43.10 Crypto files wu 1
Weird_RSA UMassCTF 2021 23.56 Crypto files wu 1
Finished_Ninjago_Game UMassCTF 2026 65.95 Crypto files
Hens_and_Roosters UMassCTF 2026 65.95 Crypto files
Unfinished_Ninjago_Game UMassCTF 2026 65.95 Crypto files
Brainrot_Gamba UMassCTF 2025 48.38 Crypto files
BuRGerCode UMassCTF 2025 48.38 Crypto files
Disordered_Tree UMassCTF 2025 48.38 Crypto files
Hot_and_Heavy UMassCTF 2025 48.38 Crypto files
Lazy_Streamer UMassCTF 2025 48.38 Crypto files
xorsa UMassCTF 2025 48.38 Crypto files
Brutal_Mogging UMassCTF 2024 43.10 Crypto files
fastcrypt UMassCTF 2022 23.56 Crypto files
mtrsass UMassCTF 2022 23.56 Crypto files
order_of_the_eight_apollonii UMassCTF 2022 23.56 Crypto files
tomb_of_tutanflagun UMassCTF 2022 23.56 Crypto files
Factoring_is_Fun UMassCTF 2021 23.56 Crypto files