2020 EUROPEAN CYBER SECURITY CHALLENGE

3-7 November 2020

Vienna, Austria

Ancient Signal

Event HACKFEST2020
Tags Crypto Forensics Network traffic
Difficulty
Medium
Additional Info
Description

The starship Voyager received an unusual communication. The flag is with „curlybraket” word in place of ’{’ and ’}’ but you have to submit it in the CTF{sha256} format.

The challenge is based on a network capture file containing two communication streams: an FTP stream and a TLS stream.

The FTP stream contains the TLS sessions keys used to decrypt the TLS stream.

Tasks

Find the flag.