$ ctf42

#chosen-plaintext CTF challenges

3 CTF challenges using chosen-plaintext from 3 CTFs (2021–2024), 3 with writeups.

Crypto · 3

Often combined with

#block-cipher 1 #key-recovery 1 #substitution-permutation-network 1 #permutation-cipher 1 #custom-cipher 1

Challenges

Filter and sort these in the challenge browser →

Challenge CTF Weight Category Has
A_Simple_SP_Box
#substitution-permutation-network#block-cipher#chosen-plaintext#key-recovery
 DCTF 2021 – Crypto files wu 2
SecureImageEncryption
#permutation-cipher#chosen-plaintext
 SekaiCTF 2022 24.86 Crypto files wu 1
Export_Grade_Cipher
#chosen-plaintext#custom-cipher
 UofTCTF 2024 23.90 Crypto files wu 1