Secure Shell is one of the most common network protocols, typically used to manage remote machines through an encrypted connection. However, SSH is prone to password brute-forcing. Key-based authentication is much more secure, and private keys can even be encrypted for additional security. But eventhatisn't bulletproof since SSH private key passwords can be cracked using John the Ripper.
SSH Key-Based Authentication
The standard way of connecting to a machine via SSH uses password-based authentication. This has the advantage of being easier to set up but suffers security-wise due to being prone to brute-forcing and password guessing.
Key-based authentication, on the other hand, uses cryptography to ensure secure connections. A key pair is generated consisting of a public and private key. The private key should be kept secret and is used to connect to machines that have the matching public key.
The public key is used to encrypt communication that only the associated private key can decrypt. This makes it nearly impossible for hackers to compromise SSH sessions unless they have access to the private key.
The below steps assume you have already gained access to a target computer from your local machine. I'm using Kali Linux as the local box.
Read Full Article Here: Crack SSH Private Key with John the Ripper
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