$ ctf42

Challenges

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

Challenge CTF Weight Category Has
symmetric
#rsa#multi-prime
 UIUCTF 2025 – Crypto files wu 1
too_many_primes
#rsa#multi-prime
 UIUCTF 2025 – Crypto files wu 1
Key_in_a_Haystack
#factorization#small-primes
 UIUCTF 2024 – Crypto files wu 1
Naptime
#lwe#lattice
 UIUCTF 2024 – Crypto files wu 1
Without_a_Trace
#linear-algebra#matrix-trace
 UIUCTF 2024 – Crypto files wu 1
X_Marked_the_Spot
#xor#repeating-key
 UIUCTF 2024 – Crypto files wu 2
Morphing_Time
#elgamal#malleability
 UIUCTF 2023 – Crypto files src wu 2
Three-Time_Pad
#many-time-pad#key-reuse
 UIUCTF 2023 – Crypto files src wu 2
Bro-key-n
#rsa#partial-key-recovery
 UIUCTF 2022 – Crypto files wu 1
asr
#rsa
 UIUCTF 2022 – Crypto files src wu 1
mom_can_we_have_AES
#aes#block-cipher
 UIUCTF 2022 – Crypto files wu 1
back_to_basics
#base-conversion
 UIUCTF 2021 – Crypto files wu 3
dhke_adventure
#diffie-hellman#pohlig-hellman
 UIUCTF 2021 – Crypto files wu 2
dhke_intro
#diffie-hellman#discrete-log
 UIUCTF 2021 – Crypto files wu 2
Young_Cryptography UIUCTF 2026 – Crypto files wu 1
positive_thinking UIUCTF 2026 – Crypto files wu 1
back_to_roots UIUCTF 2025 – Crypto files wu 1
the_shortest_crypto_chal UIUCTF 2025 – Crypto files wu 1
At_Home UIUCTF 2023 – Crypto files src wu 3
Group_Project UIUCTF 2023 – Crypto files src wu 1
pow_erful UIUCTF 2021 – Crypto files wu 1
D_Side UIUCTF 2026 – Crypto files
Movement_I UIUCTF 2026 – Crypto files
Determined UIUCTF 2024 – Crypto files src
Groups UIUCTF 2024 – Crypto files
Snore_Signatures UIUCTF 2024 – Crypto files
Group_Projection UIUCTF 2023 – Crypto files src
crack_the_safe UIUCTF 2023 – Crypto files
EllipticClockCrypto UIUCTF 2022 – Crypto files src
MilitaryGradeEncryption UIUCTF 2022 – Crypto files src
That-crete_Log UIUCTF 2022 – Crypto files
WringingRings UIUCTF 2022 – Crypto files