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Gynvael Coldwind

@gynvael.bsky.social

Security researcher/programmer ⁂ Managing director @ HexArcana ⁂ @DragonSectorCTF founder ⁂ he/him

133 Posts2852 Follower59 Folgt
Paged Out!@pagedout.bsky.social · 7d ago

This wonderful wallpaper and the Issue #9 cover were created by Vasyl/Joker^NAH^TRSI. Both this and other wallpapers, as well as Issue #9 which just came out, can be downloaded from Paged Out!'s website!

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Gynvael Coldwind@gynvael.bsky.social · 2w ago

My advanced-and-fun-parts-of-Python workshop starts next week! If you like Python, don't miss out :) Also, I really like this ad which will go into the next Paged Out! issue, so I'm sharing it as well ;)

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Gynvael Coldwind@gynvael.bsky.social · last mo.

After finalizing some other workshops I finally will have some time to add the missing details to my Python Cyber Summer Camp. Meaning: If you want to get a ticket in a lower pre-sale price, there isn't too much time left. You can find it on hackArcana's website btw (see also: this image)

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Gynvael Coldwind@gynvael.bsky.social · 2mo ago

A quick note to folks who are considering attending our Kubernetes security workshop - we might end sales early, so please don't wait until the last minute. If you know it might take you a bit longer to secure funding, let me know and we'll figure something out :)

Gynvael Coldwind@gynvael.bsky.social · 3mo ago

We're running a small challenge next week on my edu site. We actually got 2 amazing k8s sec experts who made mini-quest-CTF (3 challs chained). The setup for this is an engineering marvel - probably it's more complex than we've done on any other CTFs. Anyway, Apr 29th, 6pm CEST.

hackArcana@hackarcana.bsky.social · 3mo ago

We set up a Kubernetes cluster. It looks fine at first glance. But one small detail changes everything. Will you be able to spot it? If you haven't joined yet, sign up for our "Cloud Security Challenge for Kubernetes"! 👉 link in the comment.

Gynvael Coldwind@gynvael.bsky.social · 4mo ago

Hey folks! We're running a 2-3 challenge K8s-themed mini-CTF. It's both for fun, but also to test our infra before the upcoming workshops on security of K8s. Anyway, it starts April 29, so sign up if you want to hack some Kubernetes :)

hackArcana@hackarcana.bsky.social · 4mo ago

📣 Registration for the "Cloud Security Challenge for Kubernetes" is now open! Break into a vulnerable cluster, escalate privileges, and extract secrets – just like in real-world attacks. Free / Intermediate / ~2h / Hands-on / Starts April 29 Think you can break it? 👉 hackarcana.com/k8s-challenge

Gynvael Coldwind@gynvael.bsky.social · 4mo ago

When working with computers we frequently find these cool little tidbits/tricks/tips we could share. They are too small to make a full article, but they are likely the right size for Paged Out! magazine, where each article is just 1 page 😎 CFP deadline for Issue #9: 30th April'26

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Gynvael Coldwind@gynvael.bsky.social · 4mo ago

This article reminded me of a GOATed FPGA bistream RE task from GoogleCTF - GPURTL by Robin - where the key to solving it for me was observing the pattern of changing bits in FPGA's registers. LiveOverflow made a video about it - link in the reply in case you want to check it out.

Paged Out!@pagedout.bsky.social · 4mo ago

Learning reverse engineering and hungry for some real-world tips and tricks? Check out this article by Amnesia ("Reverse Engineering Cryptography Code"). This is a solid overview with multiple approaches to the topic.

Gynvael Coldwind@gynvael.bsky.social · 4mo ago

A perfect 1-page Friday reading → here's a fun article by Jacob Strieb about (ab)using <canvas> element in HTML and PNGs to get DEFLATE compression into older browsers (without reimplementing the whole thing in JS).

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