Polymero/ctf-challenges-public

ctf-challenges-public

This repository serves as a public collection of all challenges I authored for various CTFs. Enjoy ~ !

I love to make creative and unique challenges that push the players to really think about and investigate potential vulnerabilities, instead of pulling a ready-made exploit from GitHub.

In need of Crypto challenges for your CTF? Get in touch!

2023

BlackHat MEA CTF 2023 Finals

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
Cicero	Crypto	TOY	Vigenere	★★, ★★★	Python	?	NyA
Jzhnmipi Gqffcf Hmppwfv	Crypto	IMP	RSA	★, ★★	Python	?	NyA
Denied	Crypto	IMP	Schnorr	★★, ★★★	Python	?	NyA
Tapa Shasha	Crypto	IMP	PSS	★★★, ★★	Python	?	NyA
Lunch when?	Crypto	TOY	SPN	★★★, ★★★★	Python	?	NyA
PolyCert	Crypto	IMP	RSA-SSA	★★, ★★★★★	Python	?	NyA
Ping Pong	Crypto	TOY	DSA	★★★★, ★★★★	Python	?	NyA
Joyko	Crypto	IMP	Demytko	★★★(★★), ★★★	Python	?	NyA

BlackHat MEA CTF 2023 Quals

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
Octopodal	Crypto	IMP	DLOG	★, ★	Python	?	NyA
Acceptance	Crypto	IMP	Schnorr	★, ★	Python	?	NyA
Sulfur	Crypto	TOY	ECC, Knapsack	★, ★	Python	?	NyA

CyberHub CTF 2023

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
RSA Trickster	Crypto	IMP	RSA	★, ★	Python	?	NyA
BL1ND S1D3D	Crypto	IMP	AES-CBC	★, ★★	Flask	?	NyA
Certified Weightlifter	Crypto	IMP	RSA-SSA, CA	★★, ★★★★	Python	?	NyA

GITEX Africa CTF 2023 [Website]

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
Typo Terminator I	Crypto	TOY	OTP	★, ★	Python	5	NyA
Typo Terminator II	Crypto	TOY	OTP	★, ★★	Python	1	NyA
T1M3LY T0K3NS	Crypto	IMP	AES-CTR	★★, ★	Flask	1	NyA
iMAC (re-use)	Crypto	IMP	HMAC	★★★, ★★★	Python	1	NyA
likeClockwork (re-use)	Crypto	TOY	RSA	★★, ★★★	Python	0	NyA

HITB Amsterdam CTF 2023 [CTFtime]

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
iMAC	Crypto	IMP	HMAC	★★★, ★★★	Python	1	NyA
Tipi	Crypto	IMP	DHE, KDF	★★, ★★	Python	1	NyA
HUFFin	Crypto	IMP	AES-CTR, Huffman	★★, ★★★	Flask	1	NyA
likeClockwork	Crypto	TOY	RSA	★★, ★★★	Python	0	NyA
CTULU	Crypto	TOY	DHE, DSA	★★★★★, ★★★★	Python	0	NyA

UMASS CTF 2023 [CTFtime]

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
Wrath of the Sweating Buddha	Crypto	TOY	Paillier	★★, ★★	Python	6	NyA

idekctf 2022* [CTFtime]

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
Cleithrophobia	Crypto	TOY	AES-CBC	★, ★	Python	58	NyA
Megalophobia	Crypto	IMP	RSA	★★★, ★★★	Python	17	NyA
Psychophobia	Crypto	IMP	ECDSA	★★★★, ★★	Python	11	my-blog

2022

BlackHat MEA CTF 2022 Finals [CTFtime]

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
LWEKE	Crypto	IMP	LWE	★★★★, ★★	Python	?	NyA
Beastly Vault	Crypto	IMP	AES-CBC, AES-GCM	★★★★★, ★★★	Flask	?	NyA
Webbed*	Crypto	IMP	AES-CBC	★, ★★	Flask	?	NyA
ECPC	Crypto	TOY	ECDSA	★★, ★★★	Python	?	NyA
Ursa Major	Crypto	TOY	RSA	★★, ★★	Python	?	NyA
Bob went Shopping	Crypto	IMP	E2EE (LINE-2018)	★★★, ★	Python	?	NyA

BlackHat MEA CTF 2022 Qualifiers [CTFtime]

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
Ursa Minor	Crypto	TOY	RSA	★, ★★	Python	?	NyA
Nothing Up My S-box	Crypto	TOY	SPN	★★, ★★★	Python	?	NyA

n00bzCTF 2022 [CTFtime]

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
RSA-OOPS	Crypto	TOY	RSA	★, ★	Python	?	NyA
Hadis Paide	Crypto	IMP	Paillier	★, ★	Python	?	NyA

HackPack CTF 2022 [CTFtime]

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
Repeating Offense	Crypto	IMP	RSA, Paillier	★, ★	Python	20	my-blog
P(ai)^3	Crypto	TOY	Paillier	★, ★	Python	20	my-blog

UMassCTF 2022 [CTFtime]

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
FastCrypt	Crypto	IMP	SPN	★, ★	Python	24	NyA
MTRSASS	Crypto	TOY	MSS, RSA	★, ★	Python	6	NyA
Tomb of Tutanflagun	Crypto	TOY	Hill	★, ★	None	3	NyA
HatMash	Crypto	TOY	Linear Algebra	★, ★	Python	1	my-blog
Order of the Eight Apollonii	Crypto	TOY	SSS	★★★, ★★	Python	1	NyA

K3RN3LCTF 2021 [CTFtime]

Challenge	Category	Type	Primitive	Difficulty1	Docker	Solves	Writeup
Twizzty Buzzinezz	Crypto	TOY	XOR	☆, ☆	None	116	my-blog
1-800-758-6237	Crypto	IMP	AES-CTR	★, ★★	Python	28	my-blog
Non-Square Freedom 1	Crypto	TOY	RSA	★★, ★	None	21	my-blog
WannaSwirl	Rev		Malware	★★	None	19	Abraxus
Non-Square Freedom 2	Crypto	TOY	RSA	★★, ★★	None	11	my-blog
Poly-Proof	Crypto	TOY	PCS	★★, ★★	Python	11	my-blog
Poly Expo go BRRRRR	Crypto	TOY	RSA	★★, ★	Python	9	my-blog
Tick Tock	Crypto	TOY	Group Theory	★, ★	Python	6	my-blog
3Dangerous Commute	Misc	PZL	Maze	★, ★	Python	5	NyA
Cozzmic Dizzcovery	Crypto	PZL	XOR	★, ★	Python	3	my-blog
HADIOR	Crypto	IMP	DSA	★, ★	Python	3	my-blog
lightningrod	Rev		XOR	★, ★★	None	3	my-blog
Beecryption	Crypto	TOY	Affine	★★, ★★★	Python	2	my-blog
Game of Secrets	Crypto	TOY	Game of Life	★★★, ★★	Python	2	my-blog
Objection!	Crypto	IMP	DSA	★★★, ★	Python	2	my-blog
Ain't no Mountain High Enough	Crypto	TOY	Hill	★★, ★	Python	1	my-blog
Mowhock	Crypto	TOY	Chaos	★★★★, ★★	Python	0	NyA
Shrine of the Sweating Buddha	Crypto	TOY	Paillier	★★★★, ★★	Python	0	my-blog
Total Encryption	Crypto	IMP	RSA	★★★, ★★★★	Python	0	my-blog
WannaSwirl Fixed	Rev		Malware	★★★	None	0	Abraxus

Footnotes

1. Estimated difficulty split up in vulnerability identification (exploration) and exploitation. ↩ ↩² ↩³ ↩⁴ ↩⁵ ↩⁶ ↩⁷ ↩⁸ ↩⁹ ↩¹⁰ ↩¹¹ ↩¹² ↩¹³