Category: Random

BSidesSF CTF 2021 Author writeup: Hangman Battle Royale, where you defeat 1023 AI players!

Hi Everybody!

This is going to be a challenge-author writeup for the Hangman Battle Royale challenge from BSides San Francisco 2021.

This is actually a reasonable simple challenge, overall. I got the idea of using a bad mt19937 implementation (the Mersenne Twister PRNG used by Ruby and Python) from SANS Holiday Hack Challenge 2020 (which is still online if you want to play!), and wanted to build a challenge around it. I had the idea of Battleship originally, but ended up deciding on Hangman for reasons I no longer remember, but that I’m sure made sense at the time.

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Opening the mysterious hatch of mystery

Every once in awhile, I like to post something random here. This is another one of those times. If you want some real security info, move along now. :)

This is a story about a random locked hatch I found in the middle of a field. Originally it was just neat, but after the “Safe” incident and the creating of /r/whatsinthisthing, I realized I had to learn more. What did it contain? Tunnels? Treasure? Dragons? A valve? I didn’t know, but I had to find out!

(spoiler: it wasn’t a dragon)

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Random picture: Traffic control box

I was going to do a post about Nmap today, but since their svn is having some issues, you’re going to get something a little more fun (in my opinion)!

My friend snapped this picture in Vancouver, BC near Stanley Park (the picture is geocoded, so check out the Exif data if you want to know exactly where).

Click for a bigger version.

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