طبعا هيكون الجمعه الساعه 6 بتوقيت مصر 🤍

Of course, it will be on Friday at 6 PM Egypt time 🤍

الحمدالله 🤍

سعيد جدا و فخور اني بشارك رايتب من اصعب رايتب الي موجودين علي منصه #flagyard الرايتب عباره عن تحدي كريبتو و حاليا مفيش غير 40 انسان حول العالم بس الي قدرو علي حل تحدي




I’m happy to share a new CTF write-up I’ve published on Medium :

“Reduced Collisions” 🧠🔐

In this challenge (Cryptography – FlagYard), I analyzed a custom hash function built on linear algebra and modular arithmetic, then exploited its structure to generate hash collisions.


🔍 What this write-up covers :


Reverse engineering the provided server-side cryptographic logic
Modeling the hash function as a linear system


Applying lattice reduction (LLL algorithm) to recover valid collision vectors

Crafting a working solution to obtain the flag

This challenge was a great exercise in combining theory (linear algebra & lattices) with practical exploitation, which is something I really enjoy about cryptography-focused CTFs.

📖 Full write-up :

https://spider1sec.medium.com/ctf-write-up-reduced-collisions-9373e48adc75

حد لاحظ اني نسيت اعمل بث ؟

اجهزووو

بداء البث المباشر 🧑🏻‍💻

الحمدالله 🤍

قدرت احل كل تحديات كريبتو في FahemSec CTF 🤍


Alhamdulillah 🤍

I managed to solve all the Crypto challenges in FahemSec CTF 🤍

#CTF
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#Cryptography
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