Challenge Description

Decrypt the message and get the flag.

Don’t forget to put it into the brackets and add CTF.

Flag Proof

CTF{49c2619fc3c6ee789b1fccb46f4ac9af23130293e7cd417b34a97d8160bec5f9}

Summary

Binary to anode 7 segment display

Details

We get a file with a bunch of binary data. Upon analysing it we realise the following:

The bytes are grouped by 7
There are 17 different ways they are grouped, meaning [0-9a-f], exactly like the flag should look like
There are 64 of them, enough for the entire flag.

This means that each of the binary chunks represent one letter in the flag.

Taking a hint from the title of the challenge, we realise that we are talking about something digital. One of the things that came to mind was the 7 segment display.

I then used https://www.dcode.fr/7-segment-display to decode the binary data, and I got:

Untitled

I made the text lowercase and submitted the flag.