Description
Like a poet counting the syllables in their verses, you will have to count the instructions in a generated code.
Awaken the artist within you to produce a program equivalent to the one provided (proof-of-elapsed-time.asm),
but with minimal code size.
It will involve coding a loop with decrement and using relative jumps.
The function is inherently sequential and designed in such a way that it does not allow for algorithmic optimization, unless one knows the verification trap.
The documentation of the virtual machine is available on this page.
Files
- docker-compose.yml
-
assembly.py
20.84 KiB – db186ab7dfb5f5e7f4790f1afc951deda349a8a9565a57b6328da2ba89965525 -
crypto_accelerator.py
5.34 KiB – fe3c3f0ef53ec9e4be03ac6843b59b9879e7c8102325e2f323c1adad1e80e192 -
proof-of-elapsed-time.asm
516 B – be6fcafa362f82b44ac62a114c313d6ad7ac2d0e195818a7e0c9d62dfc81e676 -
proof-of-elapsed-time.py
1.24 KiB – d9235619c559d3ca83b3ce36cb94ecc7c3d1a4556cf9dfc3404833a7d1af6ecc -
machine.py
19.96 KiB – 048716eab19f32556b08fbea73a07b641f29fa0ff795abd407ead484e3d5041c
Author
Challenge Instructions
- First, download docker-compose.yml:
curl https://hackropole.fr/challenges/fcsc2025-hardware-proof-of-elapsed-time/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
Submit your solution
You can submit your writeup for this challenge. Read the FAQ to learn how to proceed.
You need to be logged in to submit a writeup.
Writeups
There are no public solutions for this challenge yet, but you can submit yours after getting the flag.