There were a lot of interesting talks👏 #OB12026
⚡ TOMORROW, WE BREAK THINGS >>#OB12026 IS READY!
See you tomorrow!
@offbyoneconf 2026 setup at the Grand Copthorne Waterfront Hotel Singapore.
I made this week's AlpacaHack B-side challenge.
It's the first challenge I've written since AI got strong.
Sadly it's not solved yet. Mythos, Fable, anyone?🥺
alpacahack.com/daily-bside/c…
Unfortunately it was solved mostly with libmagic unintended solution (which is easy yet clever) but at least one solver used the intended memory corruption bug in Python.
Thanks everyone who tried it! #AlpacaHack
I participated in DiceCTF 2026 Quals and found cornelslop, a kernel exploitation challenge, especially interesting. Here is my writeup🍣
ptr-yudai.hatenablog.com/ent…
Unfortunately I couldn't be on site as I have a task in the US.
It was the first time to operate KotH from remote.
I made 2 King of the Hill tasks for SECCON 14 Finals.
Thank you to everyone who participated in the event!
CovUp (Rev): Find an input with as high coverage as possible.
BidMyGadget (Pwn): Bid on ROP gadgets at auction and write the shortest ROP chain possible.
Now is good chance to travel to Japan while JPY is weak
🚀 SECCON CTF 14 – Qualifier Registration Now Open!
The online qualifier is a 24-hour full battle.
Dec 13 (Sat), 2025 05:00 UTC → Dec 14 (Sun), 2025 05:00 UTC
👇 Register here
ctf.seccon.jp
#SECCON #SECCON14 #CTF #CTFJapan #infosec #cybersecurity
Thank you everyone who participated in and supported #ICCTokyo2025!
I was there as a challenge author. ICC is one of the biggest annual event and it was a big success in this year too! Especially I loved the visualization😆
ptr-yudai retweeted
The award ceremony and the entire event of ICC TOKYO 2025 have concluded.
Thank you for the players' hard-fought match!
We appreciate support and effort of everyone who supported ICC TOKYO 2025.
#icctokyo2025
ptr-yudai retweeted
若手人材向けの国際的なサイバー競技会「International Cybersecurity Challenge」を2025年11月11〜14日に千葉市・ニューオータニ幕張で開催します（一部一般公開予定）。
最新情報を随時発信しますので、是非フォローお願いします。
#icctokyo2025
Here's my writeup for kinc from BlackHat MEA 2025 Quals.
It introduces Dirty Pageflags, a new exploitation technique inspired by Dirty Pagetable.
Big thanks to Dronex for the great discussions!
ptr-yudai.hatenablog.com/ent…
ptr-yudai retweeted
🎯 ACSC 2025 Registration is OPEN!
🕛 Start: Aug 16 (Sat) 12:00 noon
🕛 End: Aug 17 (Sun) 12:00 noon
🔗 Register now: docs.google.com/forms/d/e/1F…
🌐 Official site: acsc.asia/
🎮 The game is open to ALL players.
🌍 Finalists will be selected from ACSC member countries for #ICCTokyo2025 — but everyone’s welcome to join and play!
#ctf #acsc_ctf #icctokyo2025 #cybersecurity
ptr-yudai retweeted
【ICC2025への参加を目指す若手人材の方へ】
本年11月に開催されるICC2025に日本人選手が参加するためにはTeamAsiaの一員として選抜される必要があります。選抜の場となるACSC2025大会(@acsc_asia)が8月16日～17日に開催されますので、フォローをお願いします。
acsc.asia
#icctokyo2025