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My CTF Challenges

Challenges I've made for public CTFs.

DownUnderCTF 2020

Fri, 18 Sept. 2020, 19:00 AEST — Sun, 20 Sept. 2020, 19:00 AEST

Website | CTFTime | Official Repository

Name Category Difficulty Solves
rot-i crypto 👶 447
babyrsa crypto ⭐️ 144
Extra Cool Block Chaining crypto ⭐️⭐️ 52
Hex Shift Cipher crypto ⭐️⭐️ 44
Cosmic Rays crypto ⭐️⭐️ 25
ImpECCable crypto ⭐️⭐️⭐️ 3
1337crypt crypto ⭐️⭐️⭐️ 3
LSB||MSB Calculation Game crypto ⭐️⭐️⭐️ 2

DownUnderCTF 2021

Fri, 24 Sept. 2021, 19:00 AEST — Sun, 26 Sept. 2021, 19:00 AEST

Website | CTFTime | Official Repository

Name Category Difficulty Solves
no strings reversing 👶 934
Substitution Cipher I crypto 👶 362
Substitution Cipher II crypto ⭐️ 155
treasure crypto ⭐️ 102
flag loader reversing ⭐️ 85
write what where pwn ⭐️ 70
connect the dots reversing ⭐️⭐️ 47
ready, bounce, pwn! pwn ⭐️⭐️ 41
encrypted note pwn ⭐️⭐️⭐️ 22
flag checker reversing ⭐️⭐️⭐️ 16
gamer reversing ⭐️⭐️ 15
power sign crypto ⭐️⭐️⭐️ 14
yadlp crypto ⭐️⭐️⭐️ 14
flag printer reversing ⭐️⭐️ 8
bullet hell reversing ⭐️⭐️ 7
1337crypt v2 crypto ⭐️⭐️⭐️ 3
Substitution Cipher III crypto ⭐️⭐️⭐️ 1

DownUnderCTF 2022

Fri, 23 Sept. 2022, 19:30 AEST — Sun, 25 Sept. 2022, 19:30 AEST

Website | CTFTime | Official Repository

Name Category Difficulty Solves
babyp(y)wn pwn 👶 643
source provided rev 👶 365
baby arx crypto 👶 279
js lock rev ⭐️ 136
login pwn ⭐️ 121
oracle for block cipher enthusiasts crypto ⭐️ 102
cheap ring theory crypto ⭐️ 101
rsa interval oracle i crypto ⭐️ 79
noteworthy web ⭐️ 60
ezpz-rev rev ⭐️ 42
rsa interval oracle ii crypto ⭐️⭐️ 36
ezpz-pwn pwn ⭐️ 33
xva rev ⭐️⭐️ 30
last digit misc ⭐️ 26
Crypto Casino blockchain ⭐️ 25
rsa interval oracle iii crypto ⭐️⭐️ 23
time locked crypto ⭐️⭐️ 18
click the flag rev ⭐️⭐️ 18
battlesweeper misc ⭐️⭐️⭐️ 18
kv_db pwn ⭐️⭐️ 17
faulty arx crypto ⭐️⭐️⭐️ 11
file magic misc ⭐️⭐️ 10
pac pwn ⭐️⭐️ 7
rsa interval oracle iv crypto ⭐️⭐️⭐️ 5
EVM Vault Mechanism blockchain ⭐️⭐️⭐️ 4
1337crypt v3 crypto ⭐️⭐️⭐️ 2
kyber± crypto ⭐️⭐️⭐️⭐️ 1

DownUnderCTF 2023

Fri, 01 Sept. 2023, 19:30 AEST — Sun, 03 Sept. 2022, 19:30 AEST

Website | CTFTime | Official Repository

Name Category Difficulty Solves
static file server beginner 👶 594
downunderflow beginner 👶 521
complementary beginner 👶 436
randomly chosen beginner 👶 365
flag art beginner 👶 285
one byte beginner 👶 189
confusing beginner 👶 157
apbq rsa i crypto ⭐️ 126
masked squares flag checker rev ⭐️ 62
shifty mem pwn ⭐️⭐️ 40
mini dns server misc ⭐️⭐️ 39
sideways rev ⭐️⭐️ 29
fnv crypto ⭐️⭐️ 27
binary mail pwn ⭐️⭐️ 26
apbq rsa ii crypto ⭐️⭐️ 26
advanced vector expositions rev ⭐️⭐️⭐️ 12
lcg card gimmicks crypto ⭐️⭐️ 11
number theoretic flag checker rev ⭐️⭐️ 9
handshake crypto ⭐️⭐️⭐️ 4
encrypted mail crypto ⭐️⭐️⭐️ 3
dilithium± crypto ⭐️⭐️⭐️⭐️ 0

DownUnderCTF 2024

Fri, 05 July 2024, 19:30 AEST — Sun, 07 July 2024, 19:30 AEST

Website | CTFTime | Official Repository

Name Category Difficulty Solves
number mashing beginner 👶 299
vector overflow beginner 👶 239
decrypt then eval crypto ⭐️ 197
yawa beginner 👶 184
sign in pwn ⭐️ 95
jmp flag rev ⭐️ 71
pac shell pwn ⭐️ 55
pressing buttons rev ⭐️⭐️ 34
dungeon rev ⭐️⭐️ 22
sheep farm simulator pwn ⭐️⭐️ 21
average assembly assignment rev ⭐️⭐️ 13
pkijs< misc ⭐️⭐️ 7
Poly1305 OTM crypto ⭐️⭐️ 6
ESPecially secure boot pwn ⭐️⭐️⭐️ 3
adorable encrypted animal rev ⭐️⭐️⭐️ 3
pkijs= misc ⭐️⭐️⭐️ 1
kyber decryption oracle crypto ⭐️⭐️⭐️⭐️ 1

Blue Water CTF 2024

Sun, 13 Oct. 2024, 01:00 AEDT — Mon, 14 Oct. 2024, 13:00 AEDT

Website | CTFTime

Name Category Difficulty Solves
Kyber Noncense crypto ⭐️⭐️ 4

Cyber Apocalypse 2023

Sun, 19 March 2023, 00:00 AEDT — Thu, 23 March 2023, 23:59 AEDT

Website | CTFTime

HackTheBox approached me to develop these challenges, some details like the title and description for the challenges were created by them.

Name Category Difficulty Solves
Colliding Heritage crypto ⭐️ ?
Biased Heritage crypto ⭐️⭐️ ?

Team Oceania Qualifiers 2024

Sat, 20 January 2024, 11:00 AEDT — Sat, 20 January 2024, 18:00 AEDT

Website

Name Category Difficulty Solves
Echo Command Breaker crypto ⭐️ 17
Greeter pwn ⭐️ 9
Ruby Chef web ⭐️⭐️⭐️ 4
ESPer Flag Checker rev ⭐️⭐️⭐️ 3
Cryptography 101 Final Exam crypto ⭐️⭐️ 2
Additional Emoji Suffering crypto ⭐️⭐️⭐️ 2
Discrete Leaky PRNG crypto ⭐️⭐️ 1

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