I’ve got this private key… but why can’t I SSH? In the challenge, players were given an id_rsa file, however, they were unable to SSH into the server using that. Firstly, I tried to SSH into the server by using the given private key: sudo ssh -p 30321 user@challenge.ctf.games -i id_rsa However, the server responded with the following error: Load key 'id_rsa': error in libcrypto Upon doing a bit of research, I landed upon a StackOverflow post which suggested that the error was due to a new line character at the end of the private key file.