What is a host key and why is it needed for SSH?
A host key is a cryptographic key used for authenticating computers in the SSH protocol. Public host keys are stored on and/or distributed to SSH clients, and private keys are stored on SSH servers.
What is an SSH key pair?
The SSH key pair is used to authenticate the identity of a user or process that wants to access a remote system using the SSH protocol. The SSH public key is used by both the user and the remote server and is used to encrypt messages.
How does SSH key pair work?
Each SSH key pair includes two keys:
- A public key that is copied to the SSH server(s). Anyone with a copy of the public key can encrypt data which can then only be read by the person who holds the corresponding private key.
- A private key that remains (only) with the user.
What is known hosts in SSH?
Definition(s): A file associated with a specific account that contains one or more host keys. Each host key is associated with an SSH server address (IP or hostname) so that the server can be authenticated when a connection is initiated.
How does a client know which SSH key to use?
When a client connects to the host, wishing to use SSH key authentication, it will inform the server of this intent and will tell the server which public key to use. The server then checks its authorized_keys file for the public key, generates a random string, and encrypts it using the public key.
Where are host keys stored in the SSH protocol?
A host key is a cryptographic key used for authenticating computers in the SSH protocol. Host keys are key pairs, typically using the RSA , DSA , or ECDSA algorithms. Public host keys are stored on and/or distributed to SSH clients , and private keys are stored on SSH servers .
How to generate public and private SSH key pairs?
To use key-based authentication, you first need to generate some public/private key pairs for your client. From PowerShell or cmd, use ssh-keygen to generate some key files. This should display something like the following (where “username” is replaced by your user name) Generating public/private ed25519 key pair.
How do I add SSH key pair to my server?
Preparing your server. To add an SSH key pair, first, create a hidden folder to your user account home directory on your cloud server with the following command. mkdir -p ~/.ssh. Then restrict the permissions to that directory to just yourself with the command below. chmod 700 ~/.ssh.