Description
Morse telegraphs were used to exchange text messages over long distances by encoding a message in the form of electrical pulses. The remote server acts like a mini-telegraph and decodes the data you send it.
You must send CAN I GET THE FLAG.
You have the server code and a sample message available.
The transmission parameters are as follows:
- sampling rate: 24kHz,
- duration of a
.: 1 millisecond, - duration of a
-: 5 milliseconds, - spacing between two letters: 5 milliseconds,
- spacing between two words: 20 milliseconds.
This challenge has been split into three parts:
Files
- docker-compose.yml
-
daddy-morse.py
3.58 KiB – aeeff34616d8a97e6f179ae714d8f0622e275631c4986666caf23308f7175254 -
client.py
312 B – e23fa175a943fb6943918e9a2ba3cef3d37678a151047aae962fd23ada3f17d5 -
signal.iq
12.56 KiB – 1199792626c6894321613ec3668cb21e6521221c7665cd9b4b84db36f4e8c58e
Author
ElyKar
Challenge Instructions
- First, download docker-compose.yml:
curl https://hackropole.fr/challenges/fcsc2022-hardware-daddy-morse/docker-compose.public.yml -o docker-compose.yml - Launch the challenge by executing in the same folder:
docker compose up - Then, in another console, access the challenge with Netcat:
nc localhost 4000
In case you encounter problems, please consult the FAQ.
Flag
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