ZyXEL Communications GS2200-24P Series, Руководство пользователя, Страница: 299 / 360

Chapter 32 Access Control
GS2200-24/24P User’s Guide
299
32.8.2.1 How SSH works
The following table summarizes how a secure connection is established between
two remote hosts.
Figure 164 How SSH Works
1
Host Identification
The SSH client sends a connection request to the SSH server. The server identifies
itself with a host key. The client encrypts a randomly generated session key with
the host key and server key and sends the result back to the server.
The client automatically saves any new server public keys. In subsequent
connections, the server public key is checked against the saved version on the
client computer.
2
Encryption Method
Once the identification is verified, both the client and server must agree on the
type of encryption method to use.
3
Authentication and Data Transmission
After the identification is verified and data encryption activated, a secure tunnel is
established between the client and the server. The client then sends its
authentication information (user name and password) to the server to log in to the
server.