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HKCERT CTF 2024 Quals Writeup (I): RSA LCG and Pigeon Post :: Mystify
https://mystiz.hk/posts/2025/2025-06-29-hkcert-ctf-1/
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Black Bauhinia co-organizes the HKCERT CTF for the fifth year. I wrote 18 challenges (in 11 series) this year and here is a series of blog posts covering all of them. I will cover two cryptography series in the first part: RSA LCG and Pigeon Post.