CTF challenges & writeups

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

Challenge	CTF	Weight	Category	Has
Knapsack_vs_Backpack #subset-sum #greedy-knapsack #merkle-hellman #superincreasing-sequence	Cryptoverse 2023	24.52	Crypto	files wu 1
0ff_Again_On_Aga1n #binary-encoding #color-to-binary #image-decode	DEADFACE 2023	–	Crypto	files wu 1
B1Tz_and_B0tZ #multi-layer-encoding #binary #hex #rot13	DEADFACE 2023	–	Crypto	files wu 1
Cereal_Killer_02 #reversing #xor-rotating-key #known-plaintext	DEADFACE 2023	–	Reverse	files wu 2
Coin_Code #caesar-cipher	DEADFACE 2023	–	Crypto	files wu 1
HAM_JAM #morse-code #codablock-barcode #vigenere	DEADFACE 2023	–	Crypto	files wu 1
Letter_Soup #word-search #rot13	DEADFACE 2023	–	Crypto	files wu 1
Off_the_Rails #rail-fence-cipher	DEADFACE 2023	–	Crypto	files wu 1
Whats_the_Wallet #powershell-analysis #base64	DEADFACE 2023	–	Forensics	files wu 1
DesintegratedRSA #rsa #bit-flip-recovery #prime-reconstruction	DaVinciCTF 2023	29.26	Crypto	files wu 2
Magicplay #png-repair #file-signature-fix #forensics	DeconstruCT.F 2023	11.23	Forensics	files wu 1
4aes #aes #meet-in-the-middle (mitm)#bruteforce	Defcamp 2023 Quals	–	Crypto	files wu 1
BBBB #rsa #lcg #coppersmith	DiceCTF 2023	36.70	Crypto	files wu 1
not-baby-parallelism #reversing #cpp #custom-encoding	DiceCTF 2023	36.70	Reverse	files wu 1
seaside #csidh #isogeny #oblivious-transfer	DiceCTF 2023	36.70	Crypto	files wu 1
Careless_Padding #padding-oracle	HITCON 2023 Quals	99.75	Crypto	files wu 1
brain-hurt #xor	HSCTF 2023	–	Reverse	files wu 1
cupcakes #vigenere	HSCTF 2023	–	Crypto	files wu 1
double-trouble #caesar-cipher	HSCTF 2023	–	Crypto	files wu 3
mystery-methods #encoding-chain	HSCTF 2023	–	Reverse	files wu 2
really-small-algorithm #rsa	HSCTF 2023	–	Crypto	files wu 1
spring #java-random	HSCTF 2023	–	Crypto	files wu 1
trios #substitution-cipher	HSCTF 2023	–	Crypto	files wu 2
Cube_Hash #brute-force	Hack.lu 2023	94.73	Reverse	files wu 1
Lucky_Numbers #mersenne-prime	Hack.lu 2023	94.73	Crypto	files wu 1
Spooky_Safebox #lattice	Hack.lu 2023	94.73	Crypto	files wu 1
roks #lfi-double-encoding	ImaginaryCTF 2023	34.52	Web	files wu 2
babynotrsa #modular-inverse	IrisCTF 2023	24.59	Crypto	files wu 1
chinese-lazy-theorem-2 #crt-reconstruction	LA 2023	–	Crypto	files wu 1
greek-cipher #substitution-cipher	LA 2023	–	Crypto	files wu 2
guess-the-bit #quadratic-residue-distinguisher	LA 2023	–	Crypto	files wu 3
hill-easy #hill-cipher	LA 2023	–	Crypto	files wu 1
one-more-time-pad #known-plaintext-xor	LA 2023	–	Crypto	files wu 2
rolling-in-the-mud #pigpen-cipher	LA 2023	–	Crypto	files wu 2
switcheroo #gdb-bruteforce	LA 2023	–	Reverse	files wu 2
zero-trust #aes-gcm-nonce-reuse	LA 2023	–	Web	files wu 1
ForgeMe_2 #hash-length-extension	NahamCon 2023	34.82	Crypto	files wu 1
Just_One_More #linear-system	NahamCon 2023	34.82	Crypto	files wu 2
RSA_Intro #textbook-rsa	NahamCon 2023	34.82	Crypto	files wu 1
RSA_Outro #rsa-related-primes	NahamCon 2023	34.82	Crypto	files wu 3

Challenges