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The public key encryption used in SSH authentication makes use of two keys: a public key and a private key The public key is used to encrypt data, and the private key decrypts it Each host or user has its own public and private keys The public key is distributed to other hosts, who can then use it to encrypt authentication data that only the host s private key can decrypt For example, when a host sends data to a user on another system, the host encrypts the authentication data with a public key, which it previously received from that user The data can be decrypted only by the user s corresponding private key The public key can
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safely be sent in the open from one host to another, allowing it to be installed safely on different hosts You can think of the process as taking place between a client and a server When the client sends data to the server, it first encrypts the data using the server s public key The server can then decrypt the data using its own private key It is recommended that SSH transmissions be authenticated with public-private keys controlled by passphrases Unlike PGP, SSH uses public-key encryption for the authentication process only Once authenticated, participants agree on a common cipher to use to encrypt transmissions Authentication will verify the identity of the participants Each user who intends to use SSH to access a remote account first needs to create the public and private keys along with a passphrase to use for the authentication process A user then sends the public key to the remote account they want to access and installs the public key on that account When the user attempts to access the remote account, that account can then use the users public key to authenticate that the user is who they claim to be The process assumes that the remote account has set up its own SSH private and public key For the user to access the remote account, they will have know the remote account s SSH passphrase SSH is often used in situations where a user has two or more accounts located on different systems and wants to be able to securely access them from each other In that case, the user already has access to each account and can install SSH on each, giving each its own private and public keys along with their passphrases
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The mechanics of authentication in SSH version 1 and version 2 differ slightly However, the procedure on the part of users is the same Essentially, a user creates both public and private keys For this you use the ssh-keygen command The user s public key then has to be distributed to those users that the original user wants access to Often this is an account a user has on another host A passphrase further protects access The original user will need to know the other user s passphrase to access it SSH version 1 uses RSA authentication When a remote user tries to log in to an account, that account is checked to see if it has the remote user s public key That public key is then used to encrypt a challenge (usually a random number) that can be decrypted only by the remote user s private key When the remote user receives the encrypted challenge, that user decrypts the challenge with its private key SSH version 2 can use either RSA or DSA authentication The remote user will first encrypt a session identifier using its private key, signing it The encrypted session identifier is then decrypted by the account using the remote user s public key The session identifier has been previously set up by SSH for that session SSH authentication is first carried out with the host, and then with users Each host has its own host keys, public and private keys used for authentication Once the host is authenticated, the user is queried Each user has his or her own public and private keys Users on an SSH server who want to receive connections from remote users will have to keep a list of those remote user s public keys Similarly, an SSH host will maintain a list of public keys for other SSH hosts
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