hxp CTF 2020: Hyper

I was teamed up to play hxp CTF as @blackb6a last week. The hxp team had come up with a collection of hard challenges. In particular, there are two series of crypto challenges with a total of five parts. I will be writing on the hyper challenge and some follow-up and unanswered questions regarding to hyperelliptic curves. โ“˜ ๐—ข๐—ณ๐—ณ๐—ถ๐—ฐ๐—ถ๐—ฎ๐—น ๐˜€๐—ผ๐˜‚๐—ฟ๐—ฐ๐—ฒ๐˜€ ๐˜€๐˜๐—ฎ๐˜๐—ฒ๐—ฑ ๐˜๐—ต๐—ฎ๐˜ ๐˜๐—ต๐—ถ๐˜€ ๐—ถ๐˜€ ๐—บ๐—ถ๐˜€๐—น๐—ฒ๐—ฎ๐—ฑ๐—ถ๐—ป๐—ด Seriously. I knew nothing on hyperelliptic curves prior to the CTF....

December 20, 2020 ยท Mystiz