CTF challenges & writeups

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

Challenge	CTF	Weight	Category	Has
SSSS #shamir-secret-sharing #lagrange-interpolation	SekaiCTF 2025	55.00	Crypto	files src
RSA_Recycle #rsa #cycling-attack	ToH 2025	24.27	Crypto	files wu 1
Packeta #packer #rc4	Akasec 2024	23.15	Reverse	files wu 1
The_Worst_Challenge_Ever #custom-encoding #null-bytes	BYUCTF 2024	–	Forensics	files src
Times #elliptic-curve #ecdh	BYUCTF 2024	–	Crypto	files src
maybe_Checker #z3 #decompilation	BlueWater 2024	82.00	Reverse	files wu 1
Block_construction #aes-ecb #predictable-rng-seed	BraekerCTF 2024	24.72	Crypto	files wu 1
Computer_says_beep #tiny-pe #xor #api-resolution	BraekerCTF 2024	24.72	Reverse	files wu 1
Messengesus #xor #missing-byte	BraekerCTF 2024	24.72	Crypto	files wu 1
Thus_spoke_machine #book-cipher #twitter-ids	BraekerCTF 2024	24.72	Crypto	files wu 1
Oh_Danny #aes-cbc #iv-recovery	BroncoCTF 2024	22.51	Crypto	files wu 1
Preschool_Lessons #baconian-cipher	BroncoCTF 2024	22.51	Crypto	files wu 2
Stego_Snore_Us #bitplane-steganography #substitution-cipher	BroncoCTF 2024	22.51	Misc	files wu 1
Zodiac_Killer #zodiac-cipher #homophonic-substitution	BroncoCTF 2024	22.51	Crypto	files wu 2
dojo #rate-limit-bypass #prng-seed	BuckeyeCTF 2024	50.91	Web	files wu 1
fixpoint #base64-custom-alphabet	BuckeyeCTF 2024	50.91	Misc	files wu 1
hashbrown #aes-ecb #custom-hash	BuckeyeCTF 2024	50.91	Crypto	files wu 1
no_handouts #rop #mprotect #shellcode	BuckeyeCTF 2024	50.91	Pwn	files wu 1
rsa #rsa #factordb	BuckeyeCTF 2024	50.91	Crypto	files wu 1
the_CIA #pdf-encryption #pdf2john #hashcat	BuckeyeCTF 2024	50.91	Forensics	files wu 1
treestore #compression-oracle #merkle-tree #ipfs	BuckeyeCTF 2024	50.91	Crypto	files wu 1
zkwarmup #zero-knowledge #time-seeded-prng	BuckeyeCTF 2024	50.91	Crypto	files wu 1
4ES #meet-in-the-middle (mitm)	CrewCTF 2024	26.89	Crypto	files wu 1
Admin #aes-gcm #ghash #tag-forgery	CrewCTF 2024	26.89	Crypto	files wu 1
Bigger_and_better #coppersmith #lattice	CrewCTF 2024	26.89	Crypto	files wu 1
Boring_LCG #lcg #lll (lll-lattice-reduction)#extension-field	CrewCTF 2024	26.89	Crypto	files wu 1
Count_Collisions #hash-collision #counting	CrewCTF 2024	26.89	Misc	files wu 1
Noisy_Encryption #oracle #hamming-weight-parity	CrewCTF 2024	26.89	Crypto	files wu 1
Read_between_the_lines #rsa #lll (lll-lattice-reduction)	CrewCTF 2024	26.89	Crypto	files wu 1
Modulus_RSA #rsa #multi-prime #residue-recovery #bruteforce	CyberSpace 2024	24.83	Crypto	files wu 1
ezcoppersmith #rsa #ecm-factorization	CyberSpace 2024	24.83	Crypto	files wu 1
flagprinter #reversing #base3-digit-sum #xor-keystream	CyberSpace 2024	24.83	Crypto	files wu 2
trendy_windy_trigonity #lll (lll-lattice-reduction)#lattice-reduction #trigonometric-reconstruction	CyberSpace 2024	24.83	Crypto	files wu 1
adorable_encrypted_animal #apple-encrypted-archive #hkdf #aes-ctr	DownUnderCTF 2024	68.04	Reverse	files src
integrity #rsa #common-modulus-attack	ImaginaryCTF 2024	49.81	Crypto	files src
One_key_to_rule_them_all #signing-oracle-forgery	KalmarCTF 2024	24.21	Web	files wu 1
breakfaest #fiat-shamir-forgery	KalmarCTF 2024	24.21	Crypto	files wu 1
3_spies #hastad-broadcast #rsa #crt	Pearl 2024	23.95	Crypto	files wu 1
Rick_Roll #vigenere #rot13	Pearl 2024	23.95	Crypto	files wu 1
TooRandom #mersenne-twister #prng-state-recovery	Pearl 2024	23.95	Misc	files wu 1

Challenges