---
title: "Discussion on \"BronoCTF : Custom Cipher Writeup\" | Hashnode"
description: "Discussion on \"BronoCTF : Custom Cipher Writeup\". Break BroncoCTF PScheme by dividing ciphertext with the public polynomial, recovering quartic roots, undoing the order field, and extracting flag!"
url: "https://hashnode.com/posts/bronoctf-custom-cipher-writeup/6a53c20b4f699b847a3d24fc"
---

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# [BronoCTF : Custom Cipher Writeup](https://exploitnotes.hashnode.dev/bronoctf-custom-cipher-writeup?utm_source=hashnode&utm_medium=feed)

Break BroncoCTF PScheme by dividing ciphertext with the public polynomial, recovering quartic roots, undoing the order field, and extracting flag!

Jul 12 · 7 min read · exploitnotes.hashnode.dev  
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-   [#bronoctf](https://hashnode.com/tag/bronoctf)
-   [#python](https://hashnode.com/tag/python)
-   [#cryptography](https://hashnode.com/tag/cryptography)
-   [#pscheme](https://hashnode.com/tag/pscheme)
-   [#ctf](https://hashnode.com/tag/ctf)
-   [#ctf-crypto](https://hashnode.com/tag/ctf-crypto)
-   [#capturetheflag](https://hashnode.com/tag/capturetheflag)
-   [#cybersecurity](https://hashnode.com/tag/cybersecurity)
-   [#polynomial-division](https://hashnode.com/tag/polynomial-division)
-   [#polynomial-roots](https://hashnode.com/tag/polynomial-roots)
-   [#quadratic-equations](https://hashnode.com/tag/quadratic-equations)

## Written by

[Yogeshwar Peela](https://hashnode.com/@exploitnotes)

@exploitnotes · Vishakapatnam, India

  
[View profile](https://hashnode.com/@exploitnotes)

I write detailed writeups on HackTheBox, PicoCTF and other CTF challenges. Passionate about web exploitation, Active Directory attacks and ethical hacking

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