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What is OpenSSH authentication?
SSH public key authentication uses asymmetric cryptographic algorithms to generate two key files – one “private” and the other “public”. The private key files are the equivalent of a password, and should stay protected under all circumstances.
How do I use public key authentication?
Public key authentication works like this:
- Generate a key pair.
- Give someone (or a server) the public key.
- Later, anytime you want to authenticate, the person (or the server) asks you to prove you have the private key that corresponds to the public key.
- You prove you have the private key.
How to set up OpenSSH for SSH authentication?
To make key authentication easy with an SSH server, run the following commands from an elevated PowerShell prompt: # Install the OpenSSHUtils module to the server. This will be valuable when deploying user keys. Install-Module -Force OpenSSHUtils -Scope AllUsers # By default the ssh-agent service is disabled.
How is multi factor authentication implemented in OpenSSH?
Multi-factor authentication may be implemented with key pairs by entering a passphrase when the key pair is generated (see user key generation below). During authentication the user is prompted for the passphrase, which is used along with the presence of the private key on the SSH client to authenticate the user.
How does the SSH public key authentication work?
SSH public key authentication uses asymmetric cryptographic algorithms to generate two key files – one “private” and the other “public”. The private key files are the equivalent of a password, and should stay protected under all circumstances. If someone acquires your private key, they can log in as you to any SSH server you have access to.
Is the SSH / SFTP fingerprint the same as the public key?
Your server authentication process will be time consuming. A better way of carrying out server authentication when using SSH/SFTP is by inspecting the public key fingerprint. A fingerprint in this context is basically a hash function of a public key. Simply put, it’s a shorter equivalent of the public key.