CTF challenges & writeups

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

Challenge	CTF	Weight	Category	Has
tiramisu #invalid-curve-attack #ecdh	GoogleCTF 2021	–	Crypto	files wu 1
tonality #ecdsa #signature-forgery #key-scaling	GoogleCTF 2021	–	Crypto	files wu 1
a_little_easy_rsa #rsa #coppersmith	HITCON 2021	–	Crypto	files wu 1
magic_rsa #rsa #discrete-log #smooth-order #crt	HITCON 2021	–	Crypto	files wu 1
so_easy_but_not_rsa #mt19937 #state-recovery	HITCON 2021	–	Crypto	files wu 1
so_easy_rsa #rsa #lcg #quadratic-equation	HITCON 2021	–	Crypto	files wu 1
still_not_rsa #ntru #chosen-ciphertext-attack	HITCON 2021	–	Crypto	files wu 1
aptenodytes-forsteri #substitution-cipher	HSCTF 2021	–	Crypto	files src wu 2
opisthocomus-hoazin #known-plaintext	HSCTF 2021	–	Crypto	files src wu 2
queen-of-the-hill #hill-cipher	HSCTF 2021	–	Crypto	files src wu 2
regulus-satrapa #partial-key-exposure	HSCTF 2021	–	Crypto	files wu 1
lwsr #lfsr	Hack.lu 2021	94.48	Crypto	files wu 2
silver-water-industries #quadratic-residue	Hack.lu 2021	94.48	Crypto	files wu 3
whatthehecc #signature-forgery	Hack.lu 2021	94.48	Crypto	files wu 1
CaesarMirror #rot13	HacktivityCon 2021	–	Crypto	files wu 3
Hexahedron #rsa #rsactftool	HacktivityCon 2021	–	Crypto	files wu 1
Perfect_XOR #xor	HacktivityCon 2021	–	Crypto	files wu 3
Sausage_Links #rsa #wiener-attack #multi-prime-rsa	HacktivityCon 2021	–	Crypto	files wu 1
Triforce #aes-cbc #iv-as-key	HacktivityCon 2021	–	Crypto	files wu 1
Tyrannosaurus_Rex #known-plaintext	HacktivityCon 2021	–	Crypto	files wu 3
Vencryption #vimcrypt	HacktivityCon 2021	–	Crypto	files wu 2
h4XOR #repeating-key-xor	HeroCTF 2021	35.17	Crypto	files wu 3
Super_Super_Mario #static-binary-patching	ICHSA 2021	–	Reverse	files wu 2
one_time_beach #xor-known-plaintext	ISITDTU 2021 Quals	23.08	Crypto	files wu 1
Chicken_Caesar_Salad #caesar-cipher	ImaginaryCTF 2021	–	Crypto	files wu 1
Cookie_Stream #stream-cipher-bitflip	ImaginaryCTF 2021	–	Web	files wu 1
Flip_Flops #cbc-bit-flipping	ImaginaryCTF 2021	–	Crypto	files wu 2
Foliage #prng-reconstruction	ImaginaryCTF 2021	–	Reverse	files wu 1
Jumprope #xor-keystream	ImaginaryCTF 2021	–	Reverse	files wu 2
Lines #multiplicative-cipher	ImaginaryCTF 2021	–	Crypto	files wu 2
New_Technology #weak-key-derivation	ImaginaryCTF 2021	–	Crypto	files wu 2
Primetime #elgamal #custom-group	ImaginaryCTF 2021	–	Crypto	files wu 1
Rock_Solid_Algorithm #rsa #small-e	ImaginaryCTF 2021	–	Crypto	files wu 1
Roll_it_back #lfsr	ImaginaryCTF 2021	–	Crypto	files wu 1
Stings #substitution-cipher	ImaginaryCTF 2021	–	Reverse	files wu 3
ZKPoD #chosen-ciphertext-attack	ImaginaryCTF 2021	–	Crypto	files wu 2
babycrypto1 #aes-cbc-malleability	LINE 2021	–	Crypto	files wu 2
babycrypto2 #cbc-iv-bit-flip	LINE 2021	–	Crypto	files wu 2
babycrypto3 #rsa-cm-factorization	LINE 2021	–	Crypto	files wu 3
Filter_Collector #crt #oracle	LexingtonInformaticsTournament 2021	23.87	Crypto	files wu 1

Challenges