$ ctf42

Challenges

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

29 challenges · browse all techniques

Challenge CTF Weight Category Has
I_Like_McDonalds
#hash-length-extension-attack#mac-forgery
 BackdoorCTF 2024 – Crypto files wu 1
Curvy_Curves
#elliptic-curve-over-ring#rsa-factoring
 BackdoorCTF 2023 – Crypto files wu 1
Knapsack
#knapsack#meet-in-the-middle (mitm)
 BackdoorCTF 2023 – Crypto files wu 2
PRSA
#polynomial-ring-rsa#gf(2)-polynomial-factorization
 BackdoorCTF 2023 – Crypto files wu 1
Ambystoma_Mexicanum BackdoorCTF 2025 – Crypto files
Ambystoma_Mexicanum_Revenge BackdoorCTF 2025 – Crypto files
The_Job BackdoorCTF 2025 – Crypto files
bolt_fast BackdoorCTF 2025 – Crypto files
bread_vs_keys_v1 BackdoorCTF 2025 – Crypto files
lcg_2 BackdoorCTF 2025 – Crypto files
m4candch3353 BackdoorCTF 2025 – Crypto files
p34kC0nj3c7ur3 BackdoorCTF 2025 – Crypto files
AESwap BackdoorCTF 2024 – Crypto files
A_Complex_Shamir BackdoorCTF 2024 – Crypto files
Crazy BackdoorCTF 2024 – Crypto files
Hashing_Frenzy BackdoorCTF 2024 – Crypto files
Secure_Nonsense BackdoorCTF 2024 – Crypto files
Time_to_Break_Up BackdoorCTF 2024 – Crypto files
ColL3g10n BackdoorCTF 2023 – Crypto files
ProveMeWrong BackdoorCTF 2023 – Crypto files
Rebellious BackdoorCTF 2023 – Crypto files
Safe_Curvy_Curve BackdoorCTF 2023 – Crypto files
Secure_Matrix_Transmissions BackdoorCTF 2023 – Crypto files
Secure_Matrix_Transmissions_v2 BackdoorCTF 2023 – Crypto files
Fishy BackdoorCTF 2022 24.70 Crypto files
Morph BackdoorCTF 2022 24.70 Crypto files
RandomNonsense BackdoorCTF 2022 24.70 Crypto files
WhatTheCure BackdoorCTF 2022 24.70 Crypto files
RSANNE BackdoorCTF 2019 56.00 Crypto files src