Verify

Challenge Description

This is a straightforward challenge. Following the directions given, we just have to connect to the server via SSH:

ssh -p 60821 ctf-player@rhea.picoctf.net

SSH

There is a files directory in after we use the ls command. It seems that we will have to create a SHA checksum of all files in this directory and compare it with the checksum given to obtain the file with the actual flag.

You can create a SHA checksum of a file with sha256sum <file> or all files in a directory with sha256sum <directory>/*.

Finding the file and decrypting it

We find the path to the file by using grep to find the file with the same checksum. We can then run /decrypt.sh files/<file-name> to obtain the flag!

Flag

picoCTF{trust_but_verify_2cdcb2de}