CTF challenges & writeups

4483 challenges · browse all techniques

Challenge	CTF	Weight	Category	Has
Ring_Of_Fire #xor #logic-gates	TAMUctf 2021	–	Crypto	files wu 2
pwgen #lcg #z3	TAMUctf 2021	–	Crypto	files wu 1
JAM #hash-length-extension #md5	TFC 2021	–	Crypto	files wu 1
SEA_LANGUAGE_1 #morse-code	TFC 2021	–	Crypto	files wu 3
SEA_LANGUAGE_2 #morse-code	TFC 2021	–	Crypto	files wu 3
435 #aes	TMUCTF 2021	–	Crypto	files wu 3
Baby_Encoder #encoding #xor	TMUCTF 2021	–	Crypto	files wu 1
Common_Factor #rsa #common-factor	TMUCTF 2021	–	Crypto	files wu 2
Signed_Flag #dsa #signature	TMUCTF 2021	–	Crypto	files wu 1
Warmup #visual-cryptography	TMUCTF 2021	–	Crypto	files wu 3
baba_is_flag #signature-forgery	TSG 2021	–	Crypto	files wu 1
beginners_crypto_2021 #rsa #common-modulus #low-exponent	TSG 2021	–	Crypto	files wu 1
flag_is_win #ecdsa #ehnp #lattice	TSG 2021	–	Crypto	files wu 2
minimalist's_private #rsa #factorization	TSG 2021	–	Crypto	files wu 1
ClassicCrypto #classical-cipher #substitution	Tenable 2021	22.37	Crypto	files wu 2
EasyPeasy #base64 #encoding	Tenable 2021	22.37	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
Art_Class #maritime-signal-flags #visual-decoding	UMDCTF 2021	–	Crypto	files wu 2
Cards_Galore #mirdek-cipher #caesar-cipher	UMDCTF 2021	–	Crypto	files wu 2
Celebration #dancing-men-cipher #substitution-cipher	UMDCTF 2021	–	Crypto	files wu 2
Office_Secrets #rsa #common-modulus-attack	UMDCTF 2021	–	Crypto	files wu 1
Subway #substitution-cipher	UMDCTF 2021	–	Crypto	files wu 1
To_Be_Xor_Not_To_Be #xor	UMDCTF 2021	–	Crypto	files wu 1
Whose_Base_Is_It_Anyway #base-conversion	UMDCTF 2021	–	Crypto	files wu 2
malware #aes-ctr #known-plaintext #keystream-reuse	UMassCTF 2021	23.56	Crypto	files wu 3
CipherGauntlet #multi-layer-encoding #caesar-cipher	UTCTF 2021	–	Crypto	files wu 3
SizzlingBacon #baconian-cipher	UTCTF 2021	–	Crypto	files wu 3
VariousVernacular #substitution-cipher	UTCTF 2021	–	Crypto	files wu 2
FromTheFUTURE #substitution-cipher #futurama-alphabet	VishwaCTF 2021	–	Crypto	files wu 1
QR_Codebook #ecb #known-plaintext	VolgaCTF 2021 Quals	32.73	Crypto	files wu 1
S+7 #oulipo #n+7 #dictionary-substitution	WPICTF 2021	–	Crypto	files wu 1
1n_jection #cantor-pairing #recursive #inverse-pairing	Zh3r0 2021	–	Crypto	files src wu 1
alice_bob_dave #rsa #common-prime #gcd	Zh3r0 2021	–	Crypto	files src wu 2
import_numpy_as_MT #numpy-mt19937 #seed-bruteforce #aes-cbc	Zh3r0 2021	–	Crypto	files src wu 1
real_mersenne #mt19937 #state-recovery #float-prediction	Zh3r0 2021	–	Crypto	files src wu 2
twist_and_shout #mt19937 #state-recovery #untwist	Zh3r0 2021	–	Crypto	files src wu 2
RSASSS #rsa #hastad-broadcast-attack #crt	b01lers 2021	22.99	Crypto	files wu 1
Reasonable_Security_Ahead #rsa #franklin-reiter-related-message #coppersmith	b01lers 2021	22.99	Crypto	files wu 1

Challenges