
Rev & Crypto | Work @zellic_io | Former CTF Player @pb_ctf | DEF CON CTF 2017-2025 Finalist, 2026 Winner
South Korea
Joined June 2019
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RBTree retweeted
636606729769440499166579950236036751749912014371509557713570027508971809534551913252252094954941974952859310861988904737359709200557919
is a factor of RSA-896
saweis.net/posts/rsa-896.htmโฆ
Default configuration of WKWebView can cause downloaded files to instead be rendered on the host page.
This allows HTML injection, and sometimes even XSS, in countless iOS and WebKit apps.
PlayStation 5. Firefox. X. Instagram. TikTok. Telegram. Binance...
Breakdown and POC. ๐งต
here's the writeup of the factorization!
cognition.com/blog/factoringโฆ
Last week we published a factorization of RSA-260.
Today, weโre sharing the methodology of how Devin and a Cognition researcher built the worldโs fastest GPU optimized lattice siever, to make factoring numbers 10x cheaper than the previous state of the art:
cognition.com/blog/factoringโฆ
RBTree retweeted
Security is foundational to everything we build at ZODL.
We've engaged @zellic_io, one of the most respected security firms in the space, as our Interim Director of Security.
Zellic will provide dedicated security leadership while we search for a permanent leader for the role.
A malicious dApp shows a harmless call.
You click Sign.
It adds a second transaction, and the wallet signs both.
Your account is now empty.
V12 found this and four more Ambire Wallet bugs, including one that lets a malicious subdomain sign into a dApp as you.
Hereโs how:
RBTree retweeted
My third @PwnieAwards trophy! Thanks all, and to my friends who grabbed it on stage for me! ๐ฆ๐
RBTree retweeted
WE ARE DEF CON CTF CHAMPIONS! ๐
What a run. What a team.
After all the late nights, endless debugging, and insane battles, we finally made it.
DEF CON CTF 2026 โ CHAMPIONS.
So proud of everyone who fought together. ๐
RBTree retweeted
I primarily used ChatGPT Pro x20 during the DEF CON CTF Finals, and at least for me, it was more than sufficient to compete effectively. There is no doubt that LLMs have significantly changed the nature of CTFs, but I don't think that change is necessarily for the worse.
RBTree retweeted
Congratulations to Cognition engineers @sampriti0 and Alex Lin for winning DEF CON CTF!
RBTree retweeted
Blue Water๐ฆ= @pb_ctf, @Water_Paddler, @BunkyoWesterns, defunct, r00timentary, RedBud, undef1ned
Thank you BBB, @Nautilus_CTF, @oooverflow for hosting all these years.
Thanks to CTF for bringing us all together. We'll always be grateful to everyone we played with (or against)โ๏ธ
RBTree retweeted
We won DEF CON CTF!
perfect blue first formed in 2018 for DEF CON quals. We went from not qualifying, to 6th, 5th, and 2nd place. Dreams do come true๐ฅฒ
This was the last big CTF we wanted to win. It's bittersweet but a good end. Thanks for all the great memories over the years.
RBTree retweeted
My last CTF is over. (with Cold Fusion)
We even took 4th this year! That's all thanks to my teammates.
On paper I was the captain, but Cold Fusion was literally a fusion of many teams. I want to use this space to thank the leaders and members of each team who quietly committed themselves to these competitions, seen or not. And everyone who passed through the team too.
I threw the team together just to somehow make it to DEF CON, so it still surprises me that we made finals every year. It feels like yesterday that I was thinking "let's just get there once."
Being able to run a team this good for three years and getting to compete was such a good experience. I don't know about next year, but I hope someone who still wants to do CTF picks up Cold Fusion and keeps it going. Maybe that's asking too much.
๋ํ๊ฐ ๋๋๊ณ ์๊ฐํ๊ฒ ๋๋ ๊ฒ: ์ด๋ป๊ฒ ํ๋ฉด tokenmaxxing์ผ๋ก๋ถํฐ ์์ ๋ก์ด ๋ฌธ์ ๋ฅผ ์ค๊ณํ๋๊ฐ?
๊ธฐ๋ฒ์ ๋ฌธ์ ๊ฐ ์๋๋ผ, ๋ค์๊ณผ ๊ฐ์ ํ๋ก์ฐ๋ฅผ ์๊ฐํด๋ด
์๋ค.
1. ๋ฌธ์ ๋ฅผ ๋ง๋ ๋ค/์์ ํ๋ค.
2. LLM์ ๋ฌด์๋นํ๊ฒ ๋๋ ค๋ณธ๋ค.
3. ๋ง์ฝ ๊ธฐ๋ํ๋งํผ ๋ฒํฐ์ง ๋ชปํ๋ค๋ฉด, 1๋ก ๋์๊ฐ๋ค.
๋ ๋์ ๊ฑด, ์ ๊ฐ ์ง๊ธ๊น์ง ์ถ์ ํ๊ฑฐ๋ ์ด์ผ๊ธฐ๋ฅผ ๋ค์ด๋ณธ ๋ํ CTF๋ค(์๊ธ์ด ๊ฝค ์๋)์ ์ถ์ ์๋ค์๊ฒ ๋์ ์ฃผ๋ ๊ฒ์ ์ธ์ํ๋ค๋ ๊ฒ์
๋๋ค. ๊ทธ๋ค์ ๋ํ๋ฅผ ์ฃผ์ตํ๋ค๋ ์ฌ์ค, ๊ทธ๋ฆฌ๊ณ ๊ฑฐ๋ํ ์๊ธ์ ํตํ ๊ธฐ์
/๋จ์ฒด ํ๋ณด์ ๋ ๊ด์ฌ์ด ์์ด๋ณด์์ต๋๋ค.
ํ์ฌ์ ํํ๋ก CTF ์ํ๊ณ๊ฐ ๊ณ์ ์ ์ง๋ ์ ์์์ง๋ ์ ๋ชจ๋ฅด๊ฒ ์ต๋๋ค. ํนํ ๋ณด์์ด ์๋ CTF์์๋, ํ ํฐ์ด ๋ณด์๋ณด๋ค ๋ ์๋น๋๋๋ ์๋๋์ ๋จ์ํ ์ด๋ถ๋ฒ์ผ๋ก ๋ ๊ฐ๋ฆฌ๊ฒ ๋ ์๋ ์์ต๋๋ค.
๋ญ๊ฐ ์๋ก์ด ํฌ๋งท์ด ํ์ํด๋ณด์ด๊ณ , ์ด๋ฏธ ํธ์ํฐ์์ ๋ง์ ๋
ผ์๊ฐ ๊ณ์ ์งํ ์ค์ธ ๊ฑฐ ๊ฐ์ต๋๋ค.






















