20 Years of Daigasso!
Earn points on music arrangement for two decades? (5)
Recent Posts
Happy 6/7 Day
6/7 is here! Most of Earth got the date right; Americans cope.
Author’s write-up for apbq-rsa-iv
This is the official write-up for the crypto challenge apbq-rsa-iv from SekaiCTF 2026, written by yours truly.
Write-up for mathjail2
This is a write-up for a crypto/golf challenge from jailCTF 2025 called mathjail2.
Write-up for lance-hard?
This is a write-up for an insanely difficult crypto challenge from KalmarCTF 2025 called lance-hard?. (Yes, the question mark is part of the challenge name.)