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Latest
DUCTF 2023: Encrypted Mail Writeup [Crypto, 3 solves]
The most fun I've had solving a challenge in a while ^-^. It's rare to have a challenge that involves attacking both the cryptographic primitive and the protocol at the same time.
Cayley Graphs and Pretty Things
A fun approachable introduction to Cayley Graphs (and a little bit of group theory), and a writeup to this little web widget I made
SEETF 2023 Author Writeup
Writeups for challenges I wrote for SEETF 2023, in the Crypto/Rev/Misc categories. Another PyJail, No Subbox, Hard To Write, Cubeland, Linear Programming
See 18 more posts
Drawing with Nothing: Exploiting aliasing and moire patterns to draw for you
Exploiting aliasing during image resizing to make shapes and 3D objects appear via Moiré patterns. Essentially a writeup behind Interference and a follow-up on my moire patterns post.
Visual Proof of Schreier Refinement Theorem and Jordan-Hölder Theorem
A follow-up from my post Visualising Homomorphisms, applied to giving a visual proof of the Schreier Refinement Theorem and Jordan-Hölder Theorem.
Visualising Homomorphisms
Visual intuitions I've accrued while studying algebra, starting with a geometric interpretation of the isomorphism theorems and application into more “involved” concepts like composition series. Currently very Group focused, might update for more objects.
Social Engineering to Solve A Crypto Challenge
Using ProtonMail's user interface to trick organisers into giving the flag
Greyhats 2022 Finals Writeup
Writeups for challenges I found interesting
SEETF 2022 Author Writeup
Writeups for challenges I wrote for SEETF 2022.
CTFSG 2022 Author Writeup and The Making Of
Writeups for challenges I wrote for CTFSG 2022, and how it's made. Contains a lot of cool trinkets.
A Surprising Place $e$ Appears In
It takes an average of $e$ randomly generated numbers in $[0,1]$ for the sum to be more than $1$
Renumbering Dice
An exploration of multiple ways to describe rolling dice, and answering questions on re-numbering dice.
An Elementary Solution to the Basel Problem
An elementary solution to the basel problem, reconstructed from memory, from a source deleted from the internet by a shitty company.
RARCTF 2021: Mini-A3S Writeup (Crypto 1500)
Solution to Mini-A3S (Crypto 1500) challenge in RARCTF 2021. The hardest challenge I've solved so far, by a long shot.
RARCTF 2021: Randompad Writeup (Crypto 700)
Solution to Randompad (Crypto 700) challenge in RARCTF 2021.
RARCTF 2021: A3S Writeup (Crypto 800)
Solution to A3S (Crypto 800) challenge in RARCTF 2021.
Abusing LOAD_FAST in Python 3 VM
Pwning Python 3 VM via an intended feature (Disclaimer: Not a vulnerability)
Magnifying the Micro with Moiré Patterns
Designing circular screen patterns that can be used to magnify grid-like stuff, like the pixels on your screen or threads in a cloth via Moiré Patterns. Also a mathematical formulation of Moiré Patterns.
CDDC 2020: A Kind Of Crypto
Solution to A Kind Of Crypto challenge in CDDC 2020. This was my first time getting introduced to ECC, and was pretty much the only good-ish challenge I rmb from this CTF (oof).
A Quadratic Recurrence Relation that Computes $\pi$
I found a recurrence relation that computes $\pi$. Here's why it works.
The Most Inefficient Way to Compute $\pi$
A surprising and incredibly inefficient way to compute $\pi$ based on coin flips
All Posts
Mathematics
Math writings!
See 6 posts
Cayley Graphs and Pretty Things
A fun approachable introduction to Cayley Graphs (and a little bit of group theory), and a writeup to this little web widget I made
Drawing with Nothing: Exploiting aliasing and moire patterns to draw for you
Exploiting aliasing during image resizing to make shapes and 3D objects appear via Moiré patterns. Essentially a writeup behind Interference and a follow-up on my moire patterns post.
Visual Proof of Schreier Refinement Theorem and Jordan-Hölder Theorem
A follow-up from my post Visualising Homomorphisms, applied to giving a visual proof of the Schreier Refinement Theorem and Jordan-Hölder Theorem.
Visualising Homomorphisms
Visual intuitions I've accrued while studying algebra, starting with a geometric interpretation of the isomorphism theorems and application into more “involved” concepts like composition series. Currently very Group focused, might update for more objects.
Renumbering Dice
An exploration of multiple ways to describe rolling dice, and answering questions on re-numbering dice.
Magnifying the Micro with Moiré Patterns
Designing circular screen patterns that can be used to magnify grid-like stuff, like the pixels on your screen or threads in a cloth via Moiré Patterns. Also a mathematical formulation of Moiré Patterns.
Security
A mishmash of articles vaguely tangent to "Security"
See 2 posts
Social Engineering to Solve A Crypto Challenge
Using ProtonMail's user interface to trick organisers into giving the flag
Abusing LOAD_FAST in Python 3 VM
Pwning Python 3 VM via an intended feature (Disclaimer: Not a vulnerability)
CTF
A collection of CTF Writeups of challenges I liked, heavily biased towards Crypto.
See 9 posts
DUCTF 2023: Encrypted Mail Writeup [Crypto, 3 solves]
The most fun I've had solving a challenge in a while ^-^. It's rare to have a challenge that involves attacking both the cryptographic primitive and the protocol at the same time.
SEETF 2023 Author Writeup
Writeups for challenges I wrote for SEETF 2023, in the Crypto/Rev/Misc categories. Another PyJail, No Subbox, Hard To Write, Cubeland, Linear Programming
Greyhats 2022 Finals Writeup
Writeups for challenges I found interesting
SEETF 2022 Author Writeup
Writeups for challenges I wrote for SEETF 2022.
CTFSG 2022 Author Writeup and The Making Of
Writeups for challenges I wrote for CTFSG 2022, and how it's made. Contains a lot of cool trinkets.
RARCTF 2021: Mini-A3S Writeup (Crypto 1500)
Solution to Mini-A3S (Crypto 1500) challenge in RARCTF 2021. The hardest challenge I've solved so far, by a long shot.
RARCTF 2021: Randompad Writeup (Crypto 700)
Solution to Randompad (Crypto 700) challenge in RARCTF 2021.
RARCTF 2021: A3S Writeup (Crypto 800)
Solution to A3S (Crypto 800) challenge in RARCTF 2021.
CDDC 2020: A Kind Of Crypto
Solution to A Kind Of Crypto challenge in CDDC 2020. This was my first time getting introduced to ECC, and was pretty much the only good-ish challenge I rmb from this CTF (oof).
Bites
Fun Facts!™
See 4 posts
A Surprising Place $e$ Appears In
It takes an average of $e$ randomly generated numbers in $[0,1]$ for the sum to be more than $1$
An Elementary Solution to the Basel Problem
An elementary solution to the basel problem, reconstructed from memory, from a source deleted from the internet by a shitty company.
A Quadratic Recurrence Relation that Computes $\pi$
I found a recurrence relation that computes $\pi$. Here's why it works.
The Most Inefficient Way to Compute $\pi$
A surprising and incredibly inefficient way to compute $\pi$ based on coin flips
Misc
Random, unorganised writings of miscellaneous topics.