Master Hidden Within the Slides

PowerPoint slide master

Description

Just made a presentation, with flag.

Attachment: challenge.pptx

Solution

Hint is already given within the challenge title, which is slide master.

Slide master is a feature that allows us to control the format of the entire presentation (source). To go to slide master settings, go to View -> Slide Master.

Scroll through all the slides and we will see a suspicious string.

Decode the string by using CyberChef and we will get the flag.

Flag

GCTF{Sl1d3sss_M4staaaaaaa}