In which file is the public key stored on the SSH server system?

The public key is stored in the authorized_keys file on the SSH server system. This file is used to store the public keys of clients that are allowed to connect to the server via SSH. When a client attempts to authenticate, the server checks the public key presented by the client against the keys listed in the authorized_keys file. If there is a match, the server grants access without requiring a password, provided that the client has the corresponding private key.

The known_hosts file is used on the client side to track the public keys of SSH hosts that the client has connected to, aiding in preventing man-in-the-middle attacks. The id_rsa file typically contains the private key for SSH authentication, which should be kept secure and not shared. The sshd_config file is the configuration file for the SSH daemon, which controls various settings for the server, but it does not hold public keys.