Read the description here: https://github.com/gw-odw/odw-2019/tree/master/Challenge/CHALLENGE.md
The file results.md.gpg contains the correct answers to all challenges. This file is encrypted with a password that you can infer from the properties of Challenge 4 events.
To decrypt this file, run
gpg -d results.md.gpg
and enter the password.
The password is composed as follows. Imagine there are N signals in the data of Challenge 4.
Event 1 at t = XXXX s [timestamps have 4 digits]
Event 2 at t = YYYY s
...
Event N at t = ZZZZ s
The password is the concatenation of the first two digits of the timestamps for all events in Challenge sorted by increasing time, ie., passwd = XXYY..ZZ
Here is an example with 3 events:
Event 1 at t = 1364 s
Event 2 at t = 2135 s
Event 3 at t = 4328 s
--> Passwd = 132143