CTF challenges & writeups

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

Challenge	CTF	Weight	Category	Has
minigen #linear-recurrence #xor #prng	RaRCTF 2021	24.53	Crypto	files wu 3
randompad #rsa #stereotyped-message	RaRCTF 2021	24.53	Crypto	files wu 1
sRSA #modular-inverse #extended-euclid	RaRCTF 2021	24.53	Crypto	files wu 3
snore #schnorr #nonce-reuse #lattice	RaRCTF 2021	24.53	Crypto	files wu 1
verybabyrev #xor	RaRCTF 2021	24.53	Reverse	files wu 3
DealBreaking #caesar-cipher	TrollCAT 2021	21.87	Crypto	files wu 1
LostInForest #base64-decoding	TrollCAT 2021	21.87	Crypto	files wu 1
RadioStationApocalypse #rsa #rsactftool	TrollCAT 2021	21.87	Crypto	files wu 2
ShowYourDedication #vigenere	TrollCAT 2021	21.87	Crypto	files wu 1
CrackSSH #rsa #weak-ssh-key	TsukuCTF 2021	–	Crypto	files wu 1
human_server #ecdsa #nonce-reuse	Union 2021	24.34	Crypto	files wu 3
why_is_a_raven #isogeny #sidh #torsion-point	Union 2021	24.34	Crypto	files wu 2
JS_is_Awesome #javascript-deobfuscation #xor	VULNCON 2021	–	Reverse	files wu 1
More_than_shellcoding #shellcode #self-modifying-code #mprotect	VULNCON 2021	–	Pwn	files wu 2
mfine #affine-cipher #bruteforce	VULNCON 2021	–	Crypto	files wu 2
Exclusive #xor #bruteforce	WORMCON 2021	–	Crypto	files wu 1
Fake_Encryption #des #ecb #block-reordering #known-plaintext	WORMCON 2021	–	Crypto	files wu 1
Invisible_Cipher #substitution-cipher #frequency-analysis	WORMCON 2021	–	Crypto	files wu 1
Skipping_the_Ropes #rot13	eHaCON 2021	–	Crypto	files wu 2
Alkaloid_Stream #stream-cipher #linear-algebra	perfectblue 2021	–	Crypto	files wu 1
GoodHash #aes-gcm #ghash	perfectblue 2021	–	Crypto	files wu 1
Steroid_Stream #stream-cipher #linear-algebra	perfectblue 2021	–	Crypto	files wu 1
eeeeeemoji #restricted-shellcode #unicode-constraint #one-gadget	0CTF 2020 Quals	–	Pwn	files wu 1
Machbook_Air #unicode-normalization #hfs-plus #canary-bruteforce #stack-buffer-overflow	Balsn 2020	25.00	Misc	files wu 1
Complex To Hell #matrix-cipher #bruteforce #known-plaintext	Crypto 2020	–	Crypto	files src
coooppersmith #coppersmith #weak-prime-generation	DEFCON 2020 Quals	67.72	Misc	files wu 1
CEEBC #cbc-mac #mac-forgery	DownUnderCTF 2020	24.44	Crypto	files src
LSB\|\|MSB Calculation Game #truncated-lcg #lattice	DownUnderCTF 2020	24.44	Crypto	files src
BitFlip1 #bit-flip	Dragon 2020	98.00	Crypto	files wu 3
BitFlip2 #bit-flip	Dragon 2020	98.00	Crypto	files wu 2
BitFlip3 #bit-flip	Dragon 2020	98.00	Crypto	files wu 2
FryingInMotion #prng-prediction	Dragon 2020	98.00	Crypto	files wu 1
Unexpected #rsa #common-factor	HSCTF 2020	–	Crypto	files src
XORed #xor	HSCTF 2020	–	Crypto	files src
Bufferfly #rop #mprotect #shellcode	TGHACK 2020	–	Misc	files wu 1
SeedSpring #predictable-rng #srand	VirSecCon 2020	22.79	Misc	files wu 2
timemachine #timing-side-channel #bruteforce	rgbCTF 2020	19.74	Misc	files wu 1
too_slow #reversing #xor #key-derivation	rgbCTF 2020	19.74	Misc	files wu 3
genius #binary-patching	BSidesSF 2019	25.00	Misc	files wu 2
securenote #heap-overflow #aes-ctr-keystream-recovery #overlapping-chunks	Balsn 2019	25.00	Misc	files wu 1

Challenges