CTF challenges & writeups

4483 challenges · browse all techniques

Challenge	CTF	Weight	Category	Has
Cipher_Mishap #octal-to-ascii-decoding	BCACTF 2021	–	Crypto	files wu 2
Easy_RSA #rsa #textbook-decryption	BCACTF 2021	–	Crypto	files wu 3
Little_e #rsa #small-exponent-e=3 #cube-root-attack	BCACTF 2021	–	Crypto	files wu 1
Sailing_Thru_Decryption #signal-flag-decoding #binary #vigenere-cipher	BCACTF 2021	–	Crypto	files wu 2
Slightly_Harder_RSA #rsa #factordb-factorization	BCACTF 2021	–	Crypto	files wu 2
OTP1 #repeating-key-xor #xortool	BlueHens 2021	22.62	Crypto	files wu 1
OTP2 #xor #known-plaintext	BlueHens 2021	22.62	Crypto	files wu 1
OTP3 #two-time-pad #key-reuse	BlueHens 2021	22.62	Crypto	files wu 1
hot_diggity_dog #wiener-attack	BlueHens 2021	22.62	Crypto	files wu 1
Bits #rsa #lsb-oracle #discrete-log #binary-search-factoring	CSAW 2021 Quals	20.54	Crypto	files wu 3
Crack_Me #hash-cracking #salted-sha256 #hashcat	CSAW 2021 Quals	20.54	Crypto	files wu 3
Forgery #elgamal-signature #existential-forgery #unhashed-message #mask-bypass	CSAW 2021 Quals	20.54	Crypto	files src wu 3
BootlessRSA #rsa #low-exponent #cube-root	DaVinciCTF 2021	24.50	Crypto	files wu 3
Decode #encoding #hex-to-ascii #multi-layer-encoding	DaVinciCTF 2021	24.50	Crypto	files wu 1
Substitution #substitution-cipher #atbash	DaVinciCTF 2021	24.50	Crypto	files wu 3
TheMoreTheLess #rsa #multiprime #factordb	DaVinciCTF 2021	24.50	Crypto	files wu 2
md5flow #md5-collision #unicoll #hashclash #lz4 #buffer-overflow	DamCTF 2021	24.43	Crypto	files wu 1
xorpals #single-byte-xor #bruteforce	DamCTF 2021	24.43	Crypto	files wu 3
Cooking_the_Books #classical-cipher #rot47 #cyberchef #multi-encoding	DawgCTF 2021	23.29	Crypto	files wu 1
Really_Secure_Algorithm #rsa #wiener-attack	DawgCTF 2021	23.29	Crypto	files wu 3
The_Obligatory_RSA_Challenge #rsa #factordb	DawgCTF 2021	23.29	Crypto	files wu 3
TrashChain #custom-hash-collision #multiplicative-hash #modular-arithmetic	DawgCTF 2021	23.29	Crypto	files wu 3
What_the_Flip #aes-cbc #bit-flipping-attack	DawgCTF 2021	23.29	Crypto	files wu 2
Code_Decode #substitution-cipher #embedded-key	DeconstruCT.F 2021	19.69	Crypto	files wu 3
Doe_a_deer #solfa-cipher #music-cipher	DeconstruCT.F 2021	19.69	Crypto	files wu 1
RSA-1 #rsa #rsactftool #small-factor	DeconstruCT.F 2021	19.69	Crypto	files wu 3
RSA-2 #rsa #low-exponent #cube-root	DeconstruCT.F 2021	19.69	Crypto	files wu 3
RSA-3 #rsa #wiener-attack	DeconstruCT.F 2021	19.69	Crypto	files wu 3
The_Conspiracy #base64 #geo-coordinates #country-lookup	DeconstruCT.F 2021	19.69	Crypto	files wu 3
benaloh #benaloh-cryptosystem #lcg-nonce #higher-residuosity	DiceCTF 2021	24.82	Crypto	files wu 1
garbled #garbled-circuits #meet-in-the-middle (mitm)	DiceCTF 2021	24.82	Crypto	files wu 1
signature-sheep-scheming-signature-schemes #lattice-signature #mask-recovery	DiceCTF 2021	24.82	Crypto	files wu 1
Break_Me #ecb-oracle	DownUnderCTF 2021	–	Crypto	files wu 3
Substitution_Cipher_I #substitution-cipher	DownUnderCTF 2021	–	Crypto	files src wu 3
Substitution_Cipher_II #lagrange-interpolation	DownUnderCTF 2021	–	Crypto	files wu 1
treasure #shamir-secret-sharing	DownUnderCTF 2021	–	Crypto	files wu 1
yadlp #discrete-log	DownUnderCTF 2021	–	Crypto	files wu 1
aptenodytes-forsteri #substitution-cipher	HSCTF 2021	–	Crypto	files src wu 2
opisthocomus-hoazin #known-plaintext	HSCTF 2021	–	Crypto	files src wu 2
queen-of-the-hill #hill-cipher	HSCTF 2021	–	Crypto	files src wu 2

Challenges