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Events

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2024-03-17 11:01:31

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created at

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Server

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Open Graph

title

Black Bauhinia

description

image

site name

author

updated

2025-12-28 02:08:49

raw text

Black Bauhinia Black Bauhinia About Us CryptoCTF 2023 Writeup Welcome!! (23 points, 663 solves) Difficulty: Warm-up We surely did get warmed up this CTF, as we came second, even beating the Cryptohackers (merge) team! Well done to everyone who participated 💜 Did it! (33 points, 220 solves) Difficulty: Easy The parameters $n = 127$ and $\ell = 20$ is fixed. A hidden subset of $\ell$ numbers $S \subseteq \{0, 1, \cdots, n - 1\}$ with $|S| \leq \ell$ is chosen, and we are given $13$ calls to the following oracle: Given a set $T \subseteq {0, 1, \cdots, n - 1}$ also with $|T| \leq \ell$, the server computes $T \setminus S$ and outputs $\{(u^2 + \varepsilon) \pmod{n} : u \in T \setminus S, \varepsilon \in \{0, 1\}\}$.... August 28, 2023 · grhkm, nhho, TWY HKCERT CTF 2022 Making-of: Minecraft Geoguessr One challenge we wrote for HKCERT CTF 2022 is Minecraft Geoguessr. In this blog post, we will talk about stuffs behind the scene, including how the challenge was cre...

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SEC and Crypto [en] (228)

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