Description
The difficulty is further increased by using code that protects the private exponent with Euclidean division (random distribution of the exponent).
This challenge is extremely difficult; it is recommended to start with challenge 1/2. Furthermore, the challenge can initially be solved locally before validating the solution using the server.
The documentation of the virtual machine is available on this page.
Files
- docker-compose.yml
-
ceci-n-est-pas-une-bellcore.py
2.24 KiB – 26d59c8a80f50daca0238387cd943de41840f2b0fb4b2d294567369ff87bd725 -
RSA_sign_masked.asm
2.77 KiB – 45bd259b15a0bc9c66abfa96327736f3ffe1714bec5908abdb98861314c2b4da -
assembly.py
20.84 KiB – db186ab7dfb5f5e7f4790f1afc951deda349a8a9565a57b6328da2ba89965525 -
crypto_accelerator.py
5.25 KiB – 1ebb35bacb5781a66565509022235f9a1e47f37273b1d35515af58523b632458 -
machine.py
20.20 KiB – 0d0792ae42774cc0252136201d247d93a8ccc77f66bc11a33269ed5ba530db42 -
machine_faulted.py
499 B – 69a8ec68c3b8c02fd84c56de685ef407c63e5d0c7759d6e2bfb729930f793b30
Author
Neige
Challenge Instructions
- First, download docker-compose.yml:
curl https://hackropole.fr/challenges/fcsc2026-hardware-ceci-n-est-pas-une-bellcore/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.
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Writeups
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