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CTF writeups from BSidesSF 2026
Description "We found this video, we know there is a flag in it somewhere!" Overview This challenge hides a flag inside a secondary video stream embedded in an MP4 file. The visible video is just b
Description We intercepted a weirdly glitched file. Apparently, Julius likes to switch things up often, every 10 pixels. We're given a file: caesar1.jpg Overview A JPEG image of sheet music has bee
Description Shoot, the trial on our copy of FlagFactory Pro expired right before we needed it for the CTF! Can you help? We're given a binary: ffpro Overview A 64-bit Linux binary simulates a piece
Description I bet my BF knows what the flag is... We're given a file: i_love_my_bf_part1.bf Overview A Brainfuck program prompts for a flag, then rejects any input with "Sorry... :(". Rather than g
Description I managed to exfiltrate a highly classified, encrypted executable, but no tool I throw at it can parse it. It doesn't even have an ELF header! Fortunately, I also managed to exfiltrate th