CTF challenges & writeups

4483 challenges · browse all techniques

Challenge	CTF	Weight	Category	Has
regulus-satrapa #partial-key-exposure	HSCTF 2021	–	Crypto	files wu 1
lwsr #lfsr	Hack.lu 2021	94.48	Crypto	files wu 2
silver-water-industries #quadratic-residue	Hack.lu 2021	94.48	Crypto	files wu 3
whatthehecc #signature-forgery	Hack.lu 2021	94.48	Crypto	files wu 1
CaesarMirror #rot13	HacktivityCon 2021	–	Crypto	files wu 3
Perfect_XOR #xor	HacktivityCon 2021	–	Crypto	files wu 3
Tyrannosaurus_Rex #known-plaintext	HacktivityCon 2021	–	Crypto	files wu 3
Vencryption #vimcrypt	HacktivityCon 2021	–	Crypto	files wu 2
Transfer #blockchain-osint	HeroCTF 2021	35.17	Crypto	files wu 3
h4XOR #repeating-key-xor	HeroCTF 2021	35.17	Crypto	files wu 3
one_time_beach #xor-known-plaintext	ISITDTU 2021 Quals	23.08	Crypto	files wu 1
Flip_Flops #cbc-bit-flipping	ImaginaryCTF 2021	–	Crypto	files wu 2
Lines #multiplicative-cipher	ImaginaryCTF 2021	–	Crypto	files wu 2
New_Technology #weak-key-derivation	ImaginaryCTF 2021	–	Crypto	files wu 2
ZKPoD #chosen-ciphertext-attack	ImaginaryCTF 2021	–	Crypto	files wu 2
babycrypto1 #aes-cbc-malleability	LINE 2021	–	Crypto	files wu 2
babycrypto2 #cbc-iv-bit-flip	LINE 2021	–	Crypto	files wu 2
babycrypto3 #rsa-cm-factorization	LINE 2021	–	Crypto	files wu 3
A_to_Z #atbash-cipher	MetaCTF 2021	–	Crypto	files wu 3
Size_Matters #rsa-factorization	MetaCTF 2021	–	Crypto	files wu 3
Thnks_fr_th_Pwds #base64-encoding	MetaCTF 2021	–	Crypto	files wu 3
Unbreakable_Encryption #otp-key-reuse	MetaCTF 2021	–	Crypto	files wu 2
Wrong_Way_on_a_One_Way_Street #hash-cracking	MetaCTF 2021	–	Crypto	files wu 3
DiceRoll #mt19937-prediction	NahamCon 2021	24.98	Crypto	files wu 3
Fake_Medallion #quantum-cloning #mersenne-twister #quantum-money	PlaidCTF 2021	99.64	Crypto	files wu 1
leaky_block_cipher #small-multiplicative-order #polynomial-factorization	PlaidCTF 2021	99.64	Crypto	files wu 2
xorsa #xor-leak-factoring #bit-by-bit-factoring #rsa	PlaidCTF 2021	99.64	Crypto	files wu 3
HackChain #solidity #delegatecall #function-pointer-jump	RCTF 2021	–	Crypto	files wu 1
Uncommon_Factors_II #rsa #implicit-factoring #lll (lll-lattice-reduction)	RCTF 2021	–	Crypto	files wu 1
RITSEC_Hash #custom-hash #bruteforce #rockyou	RITSEC 2021	–	Crypto	files wu 2
What_an_Enigma #enigma-machine	RITSEC 2021	–	Crypto	files wu 2
Baby-RSA #rsa #factordb	S4CTF 2021	24.52	Crypto	files wu 1
Baby-Xor #xor #self-shifted-xor	S4CTF 2021	24.52	Crypto	files wu 1
Sign_Wars #ecdsa #biased-nonce #lattice #mt19937	SECCON 2021	–	Crypto	files wu 1
cerberus #padding-oracle #cbc #decryption-oracle	SECCON 2021	–	Crypto	files wu 1
MiTM #diffie-hellman #meet-in-the-middle (mitm)	Securinets 2021 Quals	41.71	Crypto	files wu 1
Special #rsa #special-primes	Securinets 2021 Quals	41.71	Crypto	files wu 1
MultipleExponents #rsa #common-modulus	SunshineCTF 2021	23.34	Crypto	files wu 2
Basic_RSA #rsa #factorization	TAMUctf 2021	–	Crypto	files wu 3
Ciphper #xor	TAMUctf 2021	–	Crypto	files wu 3

Challenges