What is a CTF? A CTF, or capture-the-flag is a cybersecurity and computer science competition intended as practice to real life cyber-warfare scenarios that could potentially occur in the real world.

Dec 20, 2020 · In this series of challenge, the message Hello! The flag is: hxp{...} is xorred with an bytestream generated by an PRNG. In particular, the only difference between hyper (crypto, 294 points) and hyperhyper (crypto, 714 points) is the message lengths, respectively 45 and 93.

Jul 20, 2024 · TetCTF comes back with their great crypto challenges. I played with @blackb6a and we ended up securing the 🥉 third place. In this blog post, I will walk through adapt, a challenge which required us to make fake proofs in an IAVL tree implementation. There are only three solves during the contest period.

Dec 20, 2020 · This post outlines our solution to the crypto hyper challenge, which focuses on Hyperelliptic curves. The challenge constructs a random number generator using a Hyperelliptic curve of genus 3 (and arithmetic on it), then generates some bytes using it which it XORs with the message Hello! The flag is: hxp {...}.

Dec 20, 2020 · The first challenge, hyper, only asks us to recover by knowing : we have the first 24 bytes of both output and input, so we can recover the first 24 bytes of the PRNG, that are exactly the coefficients of .

This is a VM for playing CTFs on Windows. The VM uses Hyper-V as its hypervisor and is provisioned by Vagrant. If your host is instead Linux or OSX, checkout EpicTreasure or pwnvm. After you setup Hyper-V 1 and install Vagrant 2, you can run the VM with just

Dec 21, 2020 · Essentially, every element D J C D \in J (C) D∈J(C) can be uniquely represented as a pair u x v x \langle u (x), v (x) \rangle u(x),v(x) of polynomials in K x K [x] K[x]. This is the …

The site for HyperCTF. Contribute to Hyper-CTF/HyperCTF-site development by creating an account on GitHub.

HyperCTF is a capture-the-flag style cybersecurity competition run on the Facebook Capture The Flag platform. - HyperCTF.

Dec 20, 2020 · In particular, the only difference between hyper (crypto, 294 points) and hyperhyper (crypto, 714 points) is the message lengths, respectively 45 and 93. Without doubt, the most crucial element for this challenge is the PRNG, which is based on Jacobian of hyperelliptic curves.