Serial Keyler

Description

You need to write a generator of valid inputs for this binary, then validate it on the inputs provided by the remote service to obtain the flag.

Files

docker-compose.yml
SerialKeyler
5.98 KiB – 75525de17bd6493782256061f096e4567e0a26825fba2103c4815eeb9c121e73

Author

Cryptanalyse

Challenge Instructions

First, download docker-compose.yml:
curl https://hackropole.fr/challenges/fcsc2020-reverse-serial-keyler/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

⚠️ Important: You must solve the challenge by interacting with the Docker container through the exposed network port. Any other way is not considered valid.

In case you encounter problems, please consult the FAQ.

Flag

You don't have JavaScript actived. No problem! You can check your flag like this: echo -n 'PUT_THE_FLAG_HERE' | sha256sum # possible output: 105c785bf658c46c2215fb4a433b8c227a7955ee3f6b2a3a25ee7c9d5d8bdcee

Writeups

I've been looking for a long time and I still can't find the flag!

You can vote for the solutions you prefer by using the on their respective pages.

Date	Author	Language	Tags	Vote
2023-11-17	bluesheet	🇫🇷	TeamFrance