CTF challenges & writeups

4483 challenges · browse all techniques

Challenge	CTF	Weight	Category	Has
minithorpe #hash-reversal	hxp 2020	94.00	Crypto	files wu 1
nanothorpe #length-extension	hxp 2020	94.00	Crypto	files wu 2
octothorpe #hash-collision	hxp 2020	94.00	Crypto	files wu 1
AES-ABC #aes-ecb #ecb-penguin #custom-block-chaining #ppm-image	picoCTF 2019	–	Crypto	files wu 3
Easy1 #vigenere	picoCTF 2019	–	Crypto	files wu 1
Flags #maritime-signal-flags	picoCTF 2019	–	Crypto	files wu 1
Mr-Worldwide #gps-coordinates #geolocation	picoCTF 2019	–	Crypto	files wu 1
TheNumbers #a1z26	picoCTF 2019	–	Crypto	files wu 1
john_pollard #rsa #small-modulus-factoring #x509-certificate	picoCTF 2019	–	Crypto	files wu 2
miniRSA #rsa #small-e #cube-root	picoCTF 2019	–	Crypto	files wu 1
Not_enough_part_1	KubSTU 2026	24.83	Crypto	files wu 1
Young_Cryptography	UIUCTF 2026	–	Crypto	files wu 1
positive_thinking	UIUCTF 2026	–	Crypto	files wu 1
Cryptografie #java-reflection #filesystempreferences-encoding	plfanzen 2026	25.00	Crypto	files wu 1
forgetful #rsa #phi-multiple-leak #factoring	plfanzen 2026	25.00	Crypto	files wu 1
cube_cipher #cipher-cycle-detection	BuckeyeCTF 2025	–	Crypto	files wu 1
nitwit #winternitz-ots-forgery	BuckeyeCTF 2025	–	Crypto	files wu 1
Speak_Friend_and_Enter	DownUnderCTF 2025	91.66	Crypto	files src wu 1
Almighty_Alphabet	JerseyCTF 2025	24.73	Crypto	files wu 1
basic_sums #digit-sum-crt	KalmarCTF 2025	33.89	Crypto	files wu 2
Attack_of_the_Clones #rlwe-error-reuse	LakeCTF 2025 Quals	–	Crypto	files wu 1
Ez_Part #pohlig-hellman	LakeCTF 2025 Quals	–	Crypto	files wu 1
Guess_Flag #digit-oracle	LakeCTF 2025 Quals	–	Crypto	files wu 1
Quantum_vernam #quantum-change-of-basis	LakeCTF 2025 Quals	–	Crypto	files wu 1
Revenge_of_the_Sith #lll-lattice-attack	LakeCTF 2025 Quals	–	Crypto	files wu 1
The_Phantom_Menace #private-key-disclosure	LakeCTF 2025 Quals	–	Crypto	files wu 1
grammar_nazi #rsa-polynomial-root-recovery	MaltaCTF 2025 Quals	24.95	Crypto	files wu 1
Easy_Diffy #diffie-hellman #degenerate-generator	PwnMe 2025 Quals	24.95	Crypto	files wu 1
Mirror_Hash #custom-hash #birthday-attack #subset-sum #hash-collision	PwnMe 2025 Quals	24.95	Crypto	files wu 1
My_BetterZED #aes-cfb #iv-reuse #keystream-reuse	PwnMe 2025 Quals	24.95	Crypto	files wu 1
My_Zed #aes #iv-leaks-password #zlib #bruteforce	PwnMe 2025 Quals	24.95	Crypto	files wu 1
Vending_Machine #ecdsa #biased-nonce #signature-malleability #python-hash-collision #lattice	PwnMe 2025 Quals	24.95	Crypto	files wu 1
Plutonian_Crypto	SunshineCTF 2025	51.65	Crypto	files wu 1
RSA_Recycle #rsa #cycling-attack	ToH 2025	24.27	Crypto	files wu 1
back_to_roots	UIUCTF 2025	–	Crypto	files wu 1
the_shortest_crypto_chal	UIUCTF 2025	–	Crypto	files wu 1
sol_rps	corCTF 2025	82.00	Crypto	files wu 1
Clement	ASIS 2024 Quals	66.25	Crypto	files wu 1
Block_construction #aes-ecb #predictable-rng-seed	BraekerCTF 2024	24.72	Crypto	files wu 1
Preschool_Lessons #baconian-cipher	BroncoCTF 2024	22.51	Crypto	files wu 2

Challenges