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The three SSH layers are:ġ) The first layer creates a connection between the server and the client.

The SSH protocol gives your data securely over an unsecured network. Both machines will need an authentication key to decode the encryption.

The transaction will happen between a local device (client) and a remote server. The SSH protocol is a set of rules and guidelines that allow two machines to communicate securely over a network. If the authentication is successful, the client can access the SSH files. The sender and receiver will provide their login information or validate the SSH keys. Now that a connection has been established, the client can send a request for file operations. This information will be used by the server to authenticate and grant access to the client. The client will send a username and password. Going forward, this network will be encrypted using cryptographic keys. This concludes the establishment of a secure network. The client also calculates a hash and checks the data with the server’s public key. The server then calculates a hash of all the data exchanged so far, stamps it with its private key, and sends it to the client. The client sends its parameters to the server, which in turn replies with its parameters and public key. The key exchange is started using the algorithm supported by both. Note that both messages are in their highest supported protocol version.Īfter receiving the welcome message, the server sends its supported algorithms and session cookies. Then, the server sends an SSH welcome message to the client and receives the client’s SSH welcome message in return. To start a file transfer, a client sends a transfer or connection request to the server. Here is how an SFTP connection is established: #1 Connection Request Let us dive deeper and uncover more information on SFTP and SSH! Unlike FTP, SFTP uses a secure shell protocol to provide secure client authentication. The Secure File Transfer Protocol is an improvement on FTP.