digital-talking
Legend
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:
I made the text lowercase and submitted the flag.