CTF challenges & writeups

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

Challenge	CTF	Weight	Category	Has
Elliptigo #ecc #small-subgroup-attack	BuckeyeCTF 2021	24.81	Crypto	files wu 1
Pseudo #legendre-prng #fermat-pseudoprime	BuckeyeCTF 2021	24.81	Crypto	files wu 1
Magical_Mystery_Club #z3-solver #constraint-solving	COMPFEST 2021	–	Reverse	files wu 1
Secure_Channel #diffie-hellman #small-key-bruteforce	COMPFEST 2021	–	Crypto	files wu 1
Snab_Yes_Snab #rsa #factordb	COMPFEST 2021	–	Crypto	files wu 2
You_AES_Me_Up #aes-decryption-oracle	COMPFEST 2021	–	Crypto	files wu 2
Poison_Prime #diffie-hellman #small-subgroup-confinement	CircleCityCon 2021	25.00	Crypto	files wu 1
Paired #windows-reversing #ipc-postmessage #inter-process-code-injection #xor	CyBRICS 2021	33.32	Reverse	files wu 1
Walker #reversing #maze-traversal #xor-decode #state-machine	CyBRICS 2021	33.32	Reverse	files wu 1
payback #http-parameter-pollution #duplicate-parameter #logic-flaw	CyberSecurityRumble 2021	41.60	Crypto	files wu 2
result #pdf-encryption #pdf2john #zipcode-bruteforce	CyberSecurityRumble 2021	41.60	Crypto	files wu 3
A_Simple_SP_Box #substitution-permutation-network #block-cipher #chosen-plaintext #key-recovery	DCTF 2021	–	Crypto	files wu 2
Forgotten_secret #docker-image-forensics #layer-extraction #leaked-ssh-key	DCTF 2021	–	Crypto	files wu 1
Hercules #reversing #z3 #constraint-solving #matrix	DCTF 2021	–	Reverse	files wu 1
Julius_ancient_script #caesar-cipher #shift-cipher	DCTF 2021	–	Crypto	files wu 3
Just_Take_Your_Time #3des #time-based-key #pwntools-automation	DCTF 2021	–	Crypto	files wu 3
Lockpicking #lfsr #cows-and-bulls #state-recovery	DCTF 2021	–	Crypto	files wu 1
Private_Encryption_Mistake #rsa #partial-private-key-recovery #ocr	DCTF 2021	–	Crypto	files wu 1
This_one_is_really_basic #base64 #encoding	DCTF 2021	–	Crypto	files wu 2
Baby_MAC #cbc-mac-forgery	Dragon 2021	99.33	Crypto	files wu 2
CRC_Recursive_Challenge #crc	Dragon 2021	99.33	Crypto	files wu 2
CRC_Recursive_Challenge_warmup #crc	Dragon 2021	99.33	Crypto	files wu 2
Boombastic #nonce-reuse	FwordCTF 2021	24.42	Crypto	files wu 1
Invincible #invalid-curve-attack #ecc	FwordCTF 2021	24.42	Crypto	files wu 1
Omen #z3	FwordCTF 2021	24.42	Reverse	files wu 1
Procyon #hidden-number-problem #lattice	FwordCTF 2021	24.42	Crypto	files wu 1
Time_Machine #bruteforce	FwordCTF 2021	24.42	Reverse	files wu 1
canis-lupus-familiaris-bernardus #aes-cbc #cbc-bit-flipping	HSCTF 2021	–	Crypto	files src
Function_Pointer_Fun #z3	HackPack 2021	24.31	Reverse	files wu 3
Rusty_Chains #unicode-overflow	HackPack 2021	24.31	Pwn	files wu 1
Sanity #xor-cipher	IJCTF 2021	–	Reverse	files wu 2
Tabula_Recta #rc4-fms	InCTF 2021	70.41	Crypto	files wu 1
Trouble_With_Pairs #bls-signature	InCTF 2021	70.41	Crypto	files wu 1
find_plut0 #z3-solver	InCTF 2021	70.41	Reverse	files wu 1
1-800-758-6237 #aes-ctr-nonce-reuse	K3RN3LCTF 2021	24.37	Crypto	files wu 1
Aint_No_Mountain_High_Enough #hill-cipher	K3RN3LCTF 2021	24.37	Crypto	files wu 1
Badseed #predictable-rand	K3RN3LCTF 2021	24.37	Crypto	files wu 2
Beecryption #gf2-linearization	K3RN3LCTF 2021	24.37	Crypto	files wu 1
Cozzmic_Dizzcovery #xor-state-recovery	K3RN3LCTF 2021	24.37	Crypto	files wu 1
Game_of_Secrets #cellular-automata-keystream	K3RN3LCTF 2021	24.37	Crypto	files wu 1

Challenges