Post

00_engineer

Diver OSINT CTF 2025 00_engineer Challenge

Challenge description:

An software engineer’s nameplate was picked up near Tokyo Station. This should be a lost item. Answer the URL of the website (index page) of the company where this engineer works. Flag Format: Diver25{https://google.com}

Okay, so lets take a look at the photo that’s provided:

a picture of an access badge for a conference

Hmm, well this looks like a classic lanyard and badge for a conference. I bet the name on the badge is actually the person’s username on sites like GitHub. Checking there does in fact reveal a GitHub account for one kodai-sn.

the github acount

Even better, it looks like there a repository named kodai-sn.github.io. That’s a special repository on GitHub. If you create a website using GitHub pages, it shows up at username.github.io/repository-name. However, if the name of the repository is just username.github.io, it uses the base URL for the site, making it a good place for a personal website. This blog is served off of Slavetomints/slavetomints.github.io, and simply uses a custom domain. If you went to https://slavetomints.github.io you would also appear here. Neat right?

Anyways, lets check out the website there.

the personal website

The part I’m most interested in is the Career section, where they say they’ve been working for Magneight Software. This is probably the company who’s website we have to find.

A quick lookup later reveals magneight.com to us, and with it the solution

the company website

FLAG: Diver25{https://magneight.com/}

This post is licensed under CC BY 4.0 by the author.