What is ssh and how does it encrypt information-linux operation and maintenance

In the early days, the remote connection server used plaintext transmission software, such as telnet and RSH, and later they were all replaced by the ssh protocol. The SSH service can provide information encryption and then transmit the data, which greatly improves the security. SSH has two main functions: Ability to connect to remote hosts and manage host resources Able to transfer files, similar to ftp service SSH encryption Technology SSH uses asymmetric encryption technology. Readers who want to know more about symmetric encryption and asymmetric encryption, please Google. Asymmetric encryption is mainly accomplished through the public key and private key. The public key encrypts the information sent, and after receiving the information, the private key is used to decrypt the information. Public key (Public key): The act of encrypting the information sent to the host of the other party, so your host public key Can be given to another host that wants to communicate. Private key (Private key): When the remote host sends the information encrypted with the public key to the current host, the current host uses its own private key to decrypt the information . Remember, your private key must not be known to other hosts. The…