摘要：S
ecure Shell (SSH) Protocol is a protocol for secure network com-
munications designed to be relatively simple and inexpensive to
implement. The initial version, SSH1, focused on providing a
secure remote logon facility to replace Telnet and other remote logon
schemes that provided no security[4]
. SSH also provides a more gen-
eral client-server capability and can be used to secure such network
functions as fle transfer and e-mail. A new version, SSH2, provides
a standardized defnition of SSH and improves on SSH1 in numerous
ways. SSH2 is documented as a proposed standard in RFCs 4250
through 4256 [1–3], [5–8]
.
