18.2. SSH Protocol Versions
The SSH protocol allows any client and server programs built to the
protocol's specifications to communicate securely and to be used
interchangeably.
Two varieties of SSH currently exist. SSH version 1 makes use of several
patented encryption algorithms (however, some of these patents have
expired) and is vulnerable to a security hole that potentially allows an
attacker to insert data into the communication stream. The OpenSSH suite
under Red Hat Linux uses SSH version 2 by default, although it also supports
version 1.
 | Important |
|---|
| | It is recommended that only SSH version 2-compatible servers and
clients are used whenever possible.
|
