yellowday

hello?!

[yellowday @yellowday60]

@gosasu1 @Zcash @osec_io GOAT

[yellowday @yellowday60]

@ipwning Congrats!

[yellowday @yellowday60]

My third DEF CON CTF Finals, and we finished 2nd! 🥈

It was an incredible experience, and I’m really grateful to everyone who made it possible — the HypeBoy members, my lab mates, and Prof. Yun.

Thank you all for the great memories.

[Insu Yun @insu_yun]

My last CTF has come to an end.

I’m very proud that our team, 0x4b52, finished in second place at DEF CON CTF.

On the final day, I was a little upset—not only as a CTF player, but also as a professor. As a professor, I always want to tell my students that we should try to live and compete with integrity. As a CTF player, I deeply respect a community where each of us voluntarily chooses to uphold the spirit of the game. I believe we should hack systems, not the rules.

Of course, I understand that not everyone may see things the same way. And to be fair, I probably didn’t think this way myself when I was younger. Maybe I’ve just gotten a little older and come to believe that this is the way things should be.

Anyway, a huge thank you to BBB for organizing this competition. It is impossible to imagine how much time, effort, and volunteer work it takes to make an event like this possible. If I came across as too aggressive during the game, I’m really sorry. As a team leader, every single tick felt incredibly precious to me.

Congratulations to Blue Water. They definitely outperformed us. Some of the team members are my old friends. I really want to congratulate them.

Most of all, I’m grateful to my teammates and students. It was truly a pleasure playing together.

I had a great time. Thank you, everyone.

[yellowday @yellowday60]

Three years ago, I qualified for the Midnight Sun CTF Finals with Team CyKor.

This year, I'm returning with my labmates from KAIST Hacking Lab as HackingForMakguli.

After three years, it's time for Sweden again.
What adventures await this time?

See you in Sweden! 🇸🇪

[yellowday @yellowday60]

See you again at the DEFCON CTF Finals this year! 😀
Feels like this might be humanity’s last CTF.

[CyKor @CyKorKU]

CyKor played DEFCON 33 Quals as Cold Fusion and we’re happy to share that we qualified for the finals!!🥳
See you in Las Vegas! 🇺🇸🎰✈️

— We're currently looking for sponsors. If you're interested, feel free to contact us at [email protected]
#DEFCON33 #CTF #CyKor

[gss1 @gosasu1]

huge thanks to my team #Cold_Fusion
see you in august

[yellowday @yellowday60]

@DC0m0r1 해킹당하신듯

[Insu Yun @insu_yun]

Everyone wants to fuzz complex optimizations of WebAssembly compilers, but most approaches are simply considering grammars and types. Why can't we fuzz optimizations directly? We will share how we can do if we have systematically written optimization rules in S&P 2025 :)

[gss1 @gosasu1]

great dinner, so cute

[st4rlight @st4rlight_exp]

We, Team Cold Fusion,
are going to HITCON CTF 2024 Final.
Like last year, maple3142's web idea strong 🥲
also congrats another korean team to go final together 🇰🇷

[gss1 @gosasu1]

see you in November #Cold_Fusion

[flow @hrmm_flow]

https://t.co/Bw7f4yWJ7r

[Xion @0x10n]

😉

[yellowday @yellowday60]

G G ~
See you in Las Vegas~

[CyKor @CyKorKU]

CyKor played DEFCON 32 Quals with Cold Fusion.

[CyKor @CyKorKU]

CyKor played DEFCON 32 Quals with Cold Fusion.

[yellowday @yellowday60]

0x9b7910ddab701FF6fE7b1D81ea9DaC1d3cB95407