Rev & Crypto | Work @zellic_io | Former CTF Player @pb_ctf | DEF CON CTF 2017-2025 Finalist, 2026 Winner

South Korea
Joined June 2019
happy
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RBTree retweeted
636606729769440499166579950236036751749912014371509557713570027508971809534551913252252094954941974952859310861988904737359709200557919 is a factor of RSA-896 saweis.net/posts/rsa-896.htmโ€ฆ
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RBTree retweeted
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. ๐Ÿงต
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RBTree retweeted
here's the writeup of the factorization! cognition.com/blog/factoringโ€ฆ
Last week we published a factorization of RSA-260. Today, weโ€™re sharing the methodology of how Devin and a Cognition researcher built the worldโ€™s fastest GPU optimized lattice siever, to make factoring numbers 10x cheaper than the previous state of the art: cognition.com/blog/factoringโ€ฆ
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RBTree retweeted
4397328654844826923795068102505872571721883526553349659561256924505973939597593482272505698004801207988043088656411102133523080581 divides RSA-260
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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.
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RBTree retweeted
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. Hereโ€™s how:
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My third @PwnieAwards trophy! Thanks all, and to my friends who grabbed it on stage for me! ๐Ÿฆ„๐Ÿ†
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WE ARE DEF CON CTF CHAMPIONS! ๐Ÿ† 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. ๐Ÿ’™
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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.
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RBTree retweeted
Congratulations to Cognition engineers @sampriti0 and Alex Lin for winning DEF CON CTF!
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 true๐Ÿฅฒ 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.
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์—ํšจ ๊ฑ ๋ฏฟ๊ณ  ์‹ถ์€ ๋Œ€๋กœ ๋ฏฟ์œผ์‹ญ์‡ผ ์—ฌ๋Ÿฌ๋ถ„๋“ค์ด ๋‹ค ๋งž์Šต๋‹ˆ๋‹ค~
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RBTree retweeted
Blue Water๐Ÿ’ฆ= @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)โœŒ๏ธ
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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 true๐Ÿฅฒ 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.
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Just to clarify, we did not spend $50k on tokens at this DEF CON CTF. We paid less than that, but still we do not intend to disclose the amount :/ So please, even if it's just speculation, please don't spread rumors like this...
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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.
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๋Œ€ํšŒ๊ฐ€ ๋๋‚˜๊ณ  ์ƒ๊ฐํ•˜๊ฒŒ ๋˜๋Š” ๊ฒƒ: ์–ด๋–ป๊ฒŒ ํ•˜๋ฉด tokenmaxxing์œผ๋กœ๋ถ€ํ„ฐ ์ž์œ ๋กœ์šด ๋ฌธ์ œ๋ฅผ ์„ค๊ณ„ํ•˜๋Š”๊ฐ€? ๊ธฐ๋ฒ•์˜ ๋ฌธ์ œ๊ฐ€ ์•„๋‹ˆ๋ผ, ๋‹ค์Œ๊ณผ ๊ฐ™์€ ํ”Œ๋กœ์šฐ๋ฅผ ์ƒ๊ฐํ•ด๋ด…์‹œ๋‹ค. 1. ๋ฌธ์ œ๋ฅผ ๋งŒ๋“ ๋‹ค/์ˆ˜์ •ํ•œ๋‹ค. 2. LLM์— ๋ฌด์ž๋น„ํ•˜๊ฒŒ ๋Œ๋ ค๋ณธ๋‹ค. 3. ๋งŒ์•ฝ ๊ธฐ๋Œ€ํ•œ๋งŒํผ ๋ฒ„ํ‹ฐ์ง€ ๋ชปํ•œ๋‹ค๋ฉด, 1๋กœ ๋Œ์•„๊ฐ„๋‹ค.
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๋” ๋‚˜์œ ๊ฑด, ์ œ๊ฐ€ ์ง€๊ธˆ๊นŒ์ง€ ์ถœ์ œํ–ˆ๊ฑฐ๋‚˜ ์ด์•ผ๊ธฐ๋ฅผ ๋“ค์–ด๋ณธ ๋Œ€ํ˜• CTF๋“ค(์ƒ๊ธˆ์ด ๊ฝค ์žˆ๋Š”)์€ ์ถœ์ œ์ž๋“ค์—๊ฒŒ ๋ˆ์„ ์ฃผ๋Š” ๊ฒƒ์— ์ธ์ƒ‰ํ•˜๋‹ค๋Š” ๊ฒƒ์ž…๋‹ˆ๋‹ค. ๊ทธ๋“ค์€ ๋Œ€ํšŒ๋ฅผ ์ฃผ์ตœํ–ˆ๋‹ค๋Š” ์‚ฌ์‹ค, ๊ทธ๋ฆฌ๊ณ  ๊ฑฐ๋Œ€ํ•œ ์ƒ๊ธˆ์„ ํ†ตํ•œ ๊ธฐ์—…/๋‹จ์ฒด ํ™๋ณด์— ๋” ๊ด€์‹ฌ์ด ์žˆ์–ด๋ณด์˜€์Šต๋‹ˆ๋‹ค.
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ํ˜„์žฌ์˜ ํ˜•ํƒœ๋กœ CTF ์ƒํƒœ๊ณ„๊ฐ€ ๊ณ„์† ์œ ์ง€๋  ์ˆ˜ ์žˆ์„์ง€๋Š” ์ž˜ ๋ชจ๋ฅด๊ฒ ์Šต๋‹ˆ๋‹ค. ํŠนํžˆ ๋ณด์ƒ์ด ์žˆ๋Š” CTF์—์„œ๋Š”, ํ† ํฐ์ด ๋ณด์ƒ๋ณด๋‹ค ๋” ์†Œ๋น„๋˜๋А๋ƒ ์•„๋‹ˆ๋ƒ์˜ ๋‹จ์ˆœํ•œ ์ด๋ถ„๋ฒ•์œผ๋กœ ๋” ๊ฐˆ๋ฆฌ๊ฒŒ ๋  ์ˆ˜๋„ ์žˆ์Šต๋‹ˆ๋‹ค. ๋ญ”๊ฐ€ ์ƒˆ๋กœ์šด ํฌ๋งท์ด ํ•„์š”ํ•ด๋ณด์ด๊ณ , ์ด๋ฏธ ํŠธ์œ„ํ„ฐ์—์„œ ๋งŽ์€ ๋…ผ์˜๊ฐ€ ๊ณ„์† ์ง„ํ–‰ ์ค‘์ธ ๊ฑฐ ๊ฐ™์Šต๋‹ˆ๋‹ค.
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Replying to @RBTree_
I haven't actively played CTFs for years recently, so it does not even feel bad to lose in this way. Maybe it's a right time to quit CTF after DEFCON this year
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