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My CTF Challenges

This is some challenges I created for CTF competitions.

TSJ CTF 2022

It is recommended to read Crypto writeups here, because it supports math rendering. 2022/05/22: GitHub supports MathJax rendering on GitHub now, but it still have some compatibility issues, so you might still want to use the url above when having issues.

Name Category Tags Difficulty
Futago Crypto, CSC RSA ★
RNG++ Crypto LCG ★★
babyRSA Crypto RSA, ECC ★★
Top Secret Crypto GF, dlog ★★☆
Cipher Switching Service Crypto RSA, ElGamal ★★☆
Signature Crypto ECDSA, LLL, AES-CTR ★★★
RNG+++ Crypto LCG, LLL ★★★☆
Nim Notes Web Script Gadgets, CSRF, CRLF Injection, CSP ★★★☆
Genie [1] Web, Crypto Path traversal, AES-CBC, Deserialization ★★★☆
Just a pyjail Misc Pyjail ★★★

[1]: This challenge is made by both @splitline and me.

HITCON CTF 2022

Name Category Tags Difficulty
BabySSS Crypto SSS, CRT ★☆
Superprime Crypto Binary Search, Prune and Search ★★☆
Chimera Crypto ECM, LLL/Coppersmith, ECDLP, Hidden Subset Sum ★★★★
LemMinX Misc LSP, XXE ★★★
Secure Paste Web, Crypto JSONP, Cipher Suite Confusion, DOMPurify, CSP ★★★★

HITCON CTF 2023

Name Category Tags Difficulty
Share Crypto SSS, CRT ★★
EZRSA Crypto ECC, Wiener, ECM ★★☆
Echo Crypto RSA, Index Calculus, LLL ★★★
Random Shuffling Algorithm Crypto Noisy CRT, Coppersmith ★★★☆
Collision Crypto Code Review, Python Hash Collision ★★★☆
Lisp.js Misc Node.js Jail ★★★
Login System Web TE.TE, JSON Injection, YAML ★★★
Canvas Web JS Jail, Worker, CSP ★★★☆
Harmony Web Electron ★★★★☆

HITCON CTF 2024

Name Category Tags Difficulty
ZKPoF Crypto Python, Coppersmith ★★
BrokenShare Crypto SSS, LLL ★★★
Hyper512 Crypto LFSR, FCA ★★★☆
ECLCG Crypto ECDSA, LCG, LLL ★★★★
MatProd Crypto Linear Algebra, LLL ★★★★
Flag Reader Misc Tar ★☆
RClonE Web CSRF, RCE ★★
Truth of NPM Web Deno, LFI, RCE ★★★
Private Browsing+ Web XSS, Response Splitting ★★★★

ImaginaryCTF 2023

Name Category Tags Difficulty
Tan Crypto LLL ★★
Wasteful Crypto RSA, Coppersmith ★★
Sus Crypto RSA, Math ★★☆
Imaginary Casino Crypto CSIDH, RNG ★★☆
Login Web PHP ★☆
Sanitized Web DOMPurify, XHTML ★★★
Sanitized Revenge Web DOMPurify, XHTML ★★★
Typechecker Reverse TypeScript, Math ★★
Get and set Misc Pyjail ★★

ImaginaryCTF 2024

Name Category Tags Difficulty
lf3r Crypto LFSR ★★☆
coast Crypto Isogeny ★★☆
notitle Crypto DLP, LLL ★★★
pacap Crypto Coppersmith ★★★
vokram Reverse Markov Algorithm ★★★
readme Web Path Normalization ★
readme2 Web Bun, HTTP ★★
calc Misc Pyjail ★★★

ASIS CTF Finals 2024

Name Category Tags Difficulty
LiveMD Web XSS ★★★☆

AlpacaHack Round 9

Name Category Tags Difficulty
ffmac Crypto GF ★★★

ImaginaryCTF

Name Category Tags Difficulty
Really Simple Algorithm Crypto RSA, Continued Fractions ★★
Minimal Pwn Stack pivoting, read(2) return value, SROP ★★

These two challenges are created before I became a board of ImaginaryCTF.

Round 26

Name Category Tags Difficulty
Box Crypto Affine function ☆
pqqp Crypto RSA, Number Theory ★
First RSA Crypto RSA ★☆
No modulus Crypto RSA, LLL ★★★
Login Please Web JavaScript, Prototype ★
Read Pwn Shellcoding ★☆
Not a kernel pwn Misc Privilege Escalation ★☆
Free Shell Misc Bash ★★
Here's some Rev v2 Reverse Pyc ☆
Here's some Rev v3 Reverse LCG ★

Round 27

Name Category Tags Difficulty
RSA-CBC Crypto RSA ☆
RSA-CBC v2 Crypto RSA, Coppersmith ★☆
Mobius Crypto Rational Function, LLL ★★☆
Hello World as a Service Misc Java, Quirks ★☆
Baby Shell Pwn C++, std::string_view, UAF ★

Round 28

Name Category Tags Difficulty
Substitution Crypto RSA, Search ★☆
Unchanged Reverse pthread, LCG ★☆
Filter Master Web PHP, filter ★★
Half FFT Misc FFT, LLL ★★☆

Round 29

Name Category Tags Difficulty
Strong Prime Crypto DLP, CRT ★☆
Web3 Crypto Ethereum, ECDLP ★★
Req Bin Web Python Format String, Flask ★☆
Generic Flag Checker Reverse Signal Handler ★☆
xkcd 835 Pwn UAF ★★

Round 30

Name Category Tags Difficulty
PowerRSA Crypto RSA ★
Easy DSA: LCG Crypto ECDSA, LCG, LLL ★★☆
Fake Flags Web Trolling ☆
Echo Web Request Smuggling ★☆

Round 31

Name Category Tags Difficulty
KVIN Web/Misc JavaScript ★★

Round 32

Name Category Tags Difficulty
Poly RSA Crypto RSA, GCD ★★
Old School Web Bash, CGI ★☆

Round 33

Name Category Tags Difficulty
Vault Web XSS, Cache ★★☆

Round 34

Name Category Tags Difficulty
Integrity Crypto CRT-RSA, Coppersmith ★☆

Round 35

Name Category Tags Difficulty
Encrypted Command Executor Crypto ECB ★

Round 37

Name Category Tags Difficulty
You can't reverse me Misc/Reverse Hook ★☆

Round 39

Name Category Tags Difficulty
Safe Pickle Misc Pickle ★☆

Round 40

Name Category Tags Difficulty
Leet Universe Crypto Math ★★

Round 43

Name Category Tags Difficulty
Three Pieces Crypto Math ★☆

Round 44

Name Category Tags Difficulty
Flag Server Web HTTP Cookie ★★☆
FLT-1337 Misc Sage Trivia ☆

Round 48

Name Category Tags Difficulty
readme3 Web HTTP, Bun ★★

Round 49

Name Category Tags Difficulty
MDLP Crypto DLP, LLL ★★
MDLP v2 Crypto Coppersmith ★★☆

AIS3 Pre-exam 2022

Name Category Tags Difficulty
JeetQode Misc PPC, JQ ★☆
B64DLE Misc AES-CTR, Pickle, Python Format String ★★☆
SC Crypto Classic ☆
Fast Cipher Crypto Modular Arithmetic ☆
shamiko Crypto SHA1 Collision, DSA ★☆
Really Strange orAcle Crypto GCD, Binomial Theorem ★☆
pettan Crypto RSA Small Message, MT19937, Related Message ★★☆
pekobot Crypto Invalid Curve Attack ★★★
Flag Checker Reverse ROP, Pickle, Single Prime RSA ★★
Private Browsing Web SSRF, Redis, PHP Deserialization ★★
UTF-8 Editor Pwn C++, std::vector, OOB, GOT overwrite ★★
SAAS Pwn C++, Copy Constructor, UAF ★★☆

AIS3 Pre-exam 2023

Name Category Tags Difficulty
ECC Crypto ECC ★
Not Wiener Crypto RSA, Coppersmith ★★
Media Server Misc Python http, procfs ★★
Gitly Web 0day ★
Password Generator Pwn Math, ROP ★☆

AIS3 EOF 2023 - koh-jeopardy

Name Category Tags Difficulty
Shamiko no fukushuu Crypto ECDSA, Hmac collision ★
onelinecrypto Crypto RSA, LSB ★
NotLFSR Crypto LFSR ★☆
magicRSA Crypto RSA ★☆
Neo RSA Crypto RSA, coppersmith ★★

AIS3 EOF 2024

Name Category Tags Difficulty
Baby Side Channel Attack Crypto SCA, RSA ★
Baby ECDLP Crypto Math, ECDLP ★☆
Baby XOR Crypto Linear Algebra, LLL ★★★
Internal Web Nginx, CRLF Injection ★

AIS3 EOF 2025

Name Category Tags Difficulty
prsa Crypto RSA, Paillier ★★
zkdlp Crypto ZKP, MT19937 ★★☆

Security BSides Ahmedabad CTF 2022

Name Category Tags Difficulty
A complex number Crypto LLL ★★★