CyberChef II

This was originally a set of walkthrough challenges I created for StoutCTF 2025. They have been re-uploaded here as guides after the fact. CyberChef VIII - CyberChef X are considered to be writeups, and are in the writeups category.

CyberChef VIII: http://slavetomints.com/posts/stoutctf-cyber-chef-viii/ CyberChef IX: http://slavetomints.com/posts/stoutctf-cyber-chef-ix/ CyberChef X: http://slavetomints.com/posts/stoutctf-cyber-chef-x/

Can you decode this ciphertext?

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

Walkthrough

Welcome back to the CyberChef Walkthroughs! Here we are going to go through the basics of CyberChef, with a few extra challenges at the end for you to work on.

This time, we are going to talk about stacking up blocks to make a full fledged recipe. Last time we learned how to use just one block, but that’s pretty boring. We want to really start to push CyberChef to its limits.

All you need to do is drag another block down onto the recipe, and voilà, you have it!

Its really that easy?

Now, try and figure out how many From Base64 blocks are needed to decode this message. (Hint hint, its more than two!)

FLAG: STOUTCTF{rUgorocQNlGKuRxRTDAhQhzjwhTvaHDw}