CTF challenges & writeups

1454 challenges in family ⊕ crypto ✕ clear · browse all techniques

Challenge	CTF	Weight	Category	Has
simple_cipher #byte-at-a-time-bruteforce	TAMUctf 2021	–	Reverse	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
Broken_RSA #rsa #gcd	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-attack #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
GoldDigger #reversing #xor	Tamil 2021	14.13	Reverse	files wu 1
foolme #reversing #z3	Tamil 2021	14.13	Reverse	files wu 1
guesser #dotnet-reversing #z3	Tamil 2021	14.13	Reverse	files wu 1
ClassicCrypto #classical-cipher #substitution	Tenable 2021	22.37	Crypto	files wu 2
ECDSAImplementationReview #ecdsa #weak-nonce	Tenable 2021	22.37	Crypto	files wu 1
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
hvhpgssynt #rot13	UIUCTF 2021	–	Reverse	files wu 3
signals #self-modifying-code #mprotect	UIUCTF 2021	–	Reverse	files wu 3
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
FeistyCrypt #feistel-cipher	UMDCTF 2021	–	Reverse	files wu 1
Office_Secrets #rsa #common-modulus-attack	UMDCTF 2021	–	Crypto	files wu 1
Painting_Windows #anti-debugging #xor #windows-reversing	UMDCTF 2021	–	Reverse	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
Weird_RSA #rsa #fermat-factorization	UMassCTF 2021	23.56	Crypto	files wu 1
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
File.tetr #custom-encoding #run-length-encoding	UTCTF 2021	–	Reverse	files wu 1
SizzlingBacon #baconian-cipher	UTCTF 2021	–	Crypto	files wu 3
VariousVernacular #substitution-cipher	UTCTF 2021	–	Crypto	files wu 2

Challenges