The Joseph Challenge

APender’s Ark Challenge page tracks his progress through all challenges published by Ark (an incredible clientside web challenge author, and web author in general).

The Ark Challenge inspired me to go searching for a collection of challenges that would allow me to do something similar for binary exploitation and other areas of cybersecurity that I want to improve at, such as cryptography.

After a lot of fruitless Google searching, I decided to see if anyone else had repositories of the same name as Ark’s my-ctf-challenges repository. I did a quick Google dork and sifted through the results.

Lo-and-behold, Joseph–of Skateboarding Dog fame–was the third result, and the rest is history.


As with APender’s Ark Challenge page, I’m using this page to track my progress through all of Joseph’s CTF challenges.

If you’re doing a similar sort of challenge, you might find my generate-challenge-index.py script useful. I created it to scrape all of the challenges from Joseph’s challenge repository and reorganise them by difficulty. You can likely update it to fit your needs.

Difficulty: 👶

Name Category Solved? Writeup
rot-i crypto No Not written
no strings reversing No Not written
Substitution Cipher I crypto No Not written
babyp(y)wn pwn No Not written
source provided rev No Not written
baby arx crypto No Not written
static file server beginner No Not written
downunderflow beginner No Not written
complementary beginner No Not written
randomly chosen beginner No Not written
flag art beginner No Not written
one byte beginner No Not written
confusing beginner No Not written
number mashing beginner No Not written
vector overflow beginner No Not written
yawa beginner No Not written

Difficulty: ⭐️

Name Category Solved? Writeup
babyrsa crypto No Not written
Substitution Cipher II crypto No Not written
treasure crypto No Not written
flag loader reversing No Not written
write what where pwn No Not written
js lock rev No Not written
login pwn No Not written
oracle for block cipher enthusiasts crypto No Not written
cheap ring theory crypto No Not written
rsa interval oracle i crypto No Not written
noteworthy web No Not written
ezpz-rev rev No Not written
ezpz-pwn pwn No Not written
last digit misc No Not written
Crypto Casino blockchain No Not written
apbq rsa i crypto No Not written
masked squares flag checker rev No Not written
decrypt then eval crypto No Not written
sign in pwn No Not written
jmp flag rev No Not written
pac shell pwn No Not written
SwiftPasswordManager: ClickMe rev No Not written
fakeobj.py pwn No Not written
yet another login crypto No Not written
Touch Grass game No Not written
supeRSAnic v1.0 crypto No Not written
Long String of Flags game No Not written
Ruff-undable Goods game, web No Not written
dockjmp pwn No Not written
Colliding Heritage crypto No Not written
Echo Command Breaker crypto No Not written
Greeter pwn No Not written

Difficulty: ⭐️⭐️

Name Category Solved? Writeup
Extra Cool Block Chaining crypto No Not written
Hex Shift Cipher crypto No Not written
Cosmic Rays crypto No Not written
connect the dots reversing No Not written
ready, bounce, pwn! pwn No Not written
gamer reversing No Not written
flag printer reversing No Not written
bullet hell reversing No Not written
rsa interval oracle ii crypto No Not written
xva rev No Not written
rsa interval oracle iii crypto No Not written
time locked crypto No Not written
click the flag rev No Not written
kv_db pwn No Not written
file magic misc No Not written
pac pwn No Not written
shifty mem pwn No Not written
mini dns server misc No Not written
sideways rev No Not written
fnv crypto No Not written
binary mail pwn No Not written
apbq rsa ii crypto No Not written
lcg card gimmicks crypto No Not written
number theoretic flag checker rev No Not written
pressing buttons rev No Not written
dungeon rev No Not written
sheep farm simulator pwn No Not written
average assembly assignment rev No Not written
pkijs< misc No Not written
Poly1305 OTM crypto No Not written
SwiftPasswordManager: LoadMe rev No Not written
SwiftPasswordManager: CrackMe rev No Not written
rw.py pwn No Not written
SH-RSA crypto No Not written
Okay Buddy game, rev No Not written
uppawcase misc, pwn No Not written
disc crypto No Not written
Lucky Visitor pwn, ios No Not written
LibEatPan misc No Not written
Uninvited Visitor game, crypto No Not written
supeRSAnic v2.0 crypto No Not written
Pixelize as a Service game, pwn No Not written
Kyber Noncense crypto No Not written
Biased Heritage crypto No Not written
Cryptography 101 Final Exam crypto No Not written
Discrete Leaky PRNG crypto No Not written

Difficulty: ⭐️⭐️⭐️

Name Category Solved? Writeup
ImpECCable crypto No Not written
1337crypt crypto No Not written
encrypted note pwn No Not written
flag checker reversing No Not written
power sign crypto No Not written
yadlp crypto No Not written
1337crypt v2 crypto No Not written
Substitution Cipher III crypto No Not written
battlesweeper misc No Not written
faulty arx crypto No Not written
rsa interval oracle iv crypto No Not written
EVM Vault Mechanism blockchain No Not written
1337crypt v3 crypto No Not written
advanced vector expositions rev No Not written
handshake crypto No Not written
encrypted mail crypto No Not written
ESPecially secure boot pwn No Not written
adorable encrypted animal rev No Not written
pkijs= misc No Not written
certvalidated crypto No Not written
encrypted file server pwn, crypto No Not written
Ruby Chef web No Not written
ESPer Flag Checker rev No Not written
Additional Emoji Suffering crypto No Not written

Difficulty: ⭐️⭐️⭐️⭐️

Name Category Solved? Writeup
kyber± crypto No Not written
dilithium± crypto No Not written
kyber decryption oracle crypto No Not written