Writeup Mr. Blue Sky - UIUCTF 2025

Introduction

This is an introductory OSINT challenge. We have a Bluesky account and want to find a flag by searching through the person's profile.

Solution

To start, we can check all sections on the person's profile: Posts, Media, Videos, and Starter Packs.

In the Starter Packs section, we can see some profiles that Mr. Blue Sky recommends to us. Scrolling down the page, we find this profile with our flag.

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