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What is host key in SSH?
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.
What is the difference between Known_hosts and Authorized_keys?
4 Answers. The known_hosts file lets the client authenticate the server, to check that it isn’t connecting to an impersonator. The authorized_keys file lets the server authenticate the user.
What key is stored in Known_hosts?
The ~/. ssh/known_hosts file contains the SSH fingerprints of machines you’ve logged into. These fingerprints are generated from the remote server’s SSH key. When you secure shell into a remote machine for the first time, you are asked if you want to continue connecting (Figure A).
Can you reuse a private key?
Your private key is never sent to the other site so it’s perfectly safe to reuse the public key. It’s also OK to reuse the same key your local computers. However, bear in mind that if someone steals the key, they then have access to all of them.
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 .
What’s the difference between host and public keys?
There’s a host public key and a host private key; there are also other key pairs (public and private keys) which are not host key pairs (in SSH, users also have key pairs, with the private key residing on the client).
What’s the difference between public and private SSH keys?
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. A public-key cryptography, also known as asymmetric cryptography, is a class of cryptographic algorithms which requires two separate keys, one of which is secret (or private)…