Contents
Does SSH work without key?
Most notably, there is a key authentication system and a password authentication system. You can actually set up an SSH login on a Linux server which requires no password. However, you do need a key, but you get it from the OpenSSH utility package.
What is SSH client key?
An SSH key is an access credential in the SSH protocol. Its function is similar to that of user names and passwords, but the keys are primarily used for automated processes and for implementing single sign-on by system administrators and power users.
Where does the public key go in SSH?
Private key stays with the user (and only there), while the public key is sent to the server. Typically with the ssh-copy-id utility. Server stores the public key (and “marks” it as authorized ). Server will now allow access to anyone who can prove they have the corresponding private key.
How many keys are involved in a SSH connection?
In every SSH / SFTP connection there are four keys (or two key-pairs) involved. This article explains a difference between them and what keys an SFTP client user needs to care about. The SSH employs a public key cryptography.
Why do client only need to know the private key?
While @Pascal Cuoq’s comment is the correct answer, it is only half of the answer, since Actually, the client does need a public key – but only the server’s public key, and you already have that in your known_hosts file. If you don’t – you are asked to trust the one the server is presenting on your first connection to the server.
Can a public key be used to authenticate a user?
Only a user in possession of a private key that corresponds to the public key at the server will be able to authenticate successfully. The private keys need to be stored and handled carefully, and no copies of the private key should be distributed. The private keys used for user authentication are called identity keys.