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6/7 is here! Most of Earth got the date right; Americans cope.
Recent Posts
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.)
Author’s write-up for zerodaycrypto Permalink
This is the official write-up for the crypto challenge zerodaycrypto from SekaiCTF, written by yours truly.