![]() ![]() Where the username is the name of the user we wish to connect as, and the IP address being that of our server we are connecting to. To use SSH, we can simply pull up the terminal (for MacOS/Linux) and type: ![]() With SSH we can authenticate a remote user, for example. SSH encrypts all of our communication to and from the remote server, by the virtue of encryption. You can see why that might make some of us feel quite awkward. ![]() Historically, SSH was created as a replacement for the much more insecure protocol called Telnet, which, even though with the same purpose, doesn’t offer encryption. You might want to remote to your clients server to troubleshoot something, or to deploy some code. SSH stands for Secure Shell, and is a remote administration protocol, which gives us the ability to access, control, or modify our remote infrastructure (usually servers) over the Internet. Let’s answer all of these questions briefly (it is a very big topic), before delving further into how john can leverage some of its functionalities to crack the SSH private key password of the id_rsa files. What is SSH? When do we use it (or should)? How does it work, and what are some encryption techniques/technologies that SSH has to offer? In this article – the last in our John the Ripper series – we would like to focus on how we can use John to crack SSH keys, as well as mention some basics of Custom Rules.
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