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ssh helps protect against:
- IP spoofing, where a remote host sends out packets that pretend to
come from another, trusted host. ssh even protects against a
spoofer on the local network who can pretend they are your router to
the outside.
- IP source routing, where a host can pretend that an IP packet comes
from another, trusted host.
- DNS spoofing, where an attacker forges name server records.
- Interception of clear-text passwords and other data by intermediate
hosts.
- Manipulation of data by people in control of intermediate hosts.
- Attacks based on listening to X authentication data and spoofed
connection to the X11 server.
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