GroundRule

crypto elliptic curve linux x86/x64 FCSC 2020 solved on

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Description

A remote service allowing to execute signed binaries recently updated its security policy. Prove that its not as high as the administrator expectations.

Note: This challenge has been made for the finale of FCSC 2020.

Files

  • docker-compose.yml
  • client.py
    304 B – cb4c529168e711e41836e971ae1b9b6f43307e041fa244ecf5c259f516b2ba01
  • read_info_sign
    16.88 KiB – 2f6a6c30b461c6d696f67cedac72160e84bd841ef0fa2c6460284157cbdbdcf7
  • read_flag_sign
    16.87 KiB – 02e5f24cf01495330f18e745b8a66f856ebfea8f653a75639344d9059706a446

Author

Guena

Challenge Instructions

  1. First, download docker-compose.yml:
    curl https://hackropole.fr/challenges/fcsc2020-crypto-groundrule/docker-compose.public.yml -o docker-compose.yml
  2. Launch the challenge by executing in the same folder:
    docker compose up
  3. 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.

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