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Robert Xiao
Assistant Professor at ; CTF player with PPP ; electronics, hardware, software, HCI, security
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Robert Xiao 16. sij
Odgovor korisniku/ci @ebeip90
bytes.fromhex()/bytes().hex()
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Robert Xiao 14. sij
Wow, play.js is really cool. Full Node.js environment on iOS. Heck, it’s so complete that I got a functioning iOS torrent client in a few lines of code thanks to WebTorrent.
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Robert Xiao 17. pro
Odgovor korisniku/ci @dsredford @gf_256
In a recent CTF a teammate remarked that they were avoiding an online tool that was obviously written by a competing CTF team...
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Robert Xiao 17. pro
Odgovor korisniku/ci @gf_256
haven’t done anything worse than taboo, but definitely done everything above that (even had an energy drink that one time at SECCON then decided I was never going to use coffee or Red Bull ever again)
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Robert Xiao 17. pro
Odgovor korisniku/ci @gf_256
begging for hints- guilty; guessing flags- yep, when we have most of a flag (e.g. AI challenge); abusing clusters- yup, we’re a uni team after all; renting VPS to brute- yup, renting nearby AWS for lower latency.
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Robert Xiao proslijedio/la je tweet
Zach Wade 11. pro
When you get a flag with 20 seconds left
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Robert Xiao 9. pro
I had an amazing two days in Beijing playing with PPP. A lot of incredibly interesting and fun challenges - looking forward to next year! And, in other great news, I just found out I had a paper accepted to , so I’ll be going to Hawaii :)
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Robert Xiao 27. lis
Odgovor korisniku/ci @TerminatorET
Tree Style Tab extension on Firefox is really the best way to manage tabs. I have never switched to Chrome partly because I’d have to give that up.
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Robert Xiao 3. lis
Odgovor korisniku/ci @alokmenghrajani
🚩=277777788888989
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Robert Xiao 28. ruj
Odgovor korisniku/ci @betalars @HanEmile
Sounds like your browser developer needs to learn about recursion
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Robert Xiao 27. ruj
Odgovor korisniku/ci @matya_j @q3k
Twitter itself seems to have problems with the concept of recursion ¯\_(ツ)_/¯
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Robert Xiao 27. ruj
When you finish a PhD in computer science, they take you to a special room and explain that you must never use recursion in real life. Its only purpose is to make programming hard for undergrads.
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Robert Xiao 24. ruj
Just published my writeup for CPU Adventure at DSCTF, wherein me, , and reverse engineered a program written for a completely unknown, custom CPU with no access to the CPU, emulator or any documentation:
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Robert Xiao 20. ruj
Odgovor korisniku/ci @thepacketrat
This means that me, with my actual 8-core laptop, clocked 28 seconds while they, with a 32-core not-laptop, clocked 1:40. I should clearly start a company and claim I’ve broken RSA - my algorithm is 10x faster than theirs! 🤣🤣🤣
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Robert Xiao 20. ruj
Odgovor korisniku/ci @thepacketrat
Oh, it gets worse. I finally watched their video. They’re not running the factoring on a laptop - they’re clearly SSHed into a 32-core Linux box, and it takes them 50 seconds per key.
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Robert Xiao 20. ruj
Odgovor korisniku/ci @thepacketrat
For 512, they quite disingenuously say 5 hours using "standard computing"; I initially thought they meant also using a laptop (which would be an advance over SotA), but now it's pretty clear they meant renting cloud compute. Factoring 512-bit was demo'd in 2015 in 4 hours on EC2.
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Robert Xiao 20. ruj
Odgovor korisniku/ci @thepacketrat
Using YAFU 1.34.3 and GMP-ECM 7.0.4, I just factored two 256-bit RSA keys on my 2019 MBP (laptop) in a total of 28 seconds - completely smoking Crown Sterling's claim. And YAFU is from 2015 - almost 4 years old... for the full YAFU log.
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Robert Xiao 19. kol
Odgovor korisniku/ci @DroneInTheBox
I’ve have basically never had coffee (outside of trying the stuff and deciding I hate it). Ditto for energy drinks and even Coke. I used to be able to pull all-nighters pretty readily without those things.
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Robert Xiao 19. kol
Odgovor korisniku/ci @nickharbour @_riatre
Seems fixed now. Thanks again for the fun game & good luck to everyone playing!
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Robert Xiao 18. kol
Odgovor korisniku/ci @_riatre @nickharbour
Ah, I think I was motivated by seeing that you were already on 12, so I had to work fast to catch up XD
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