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Eavesdropping (packet sniffing)
Access to local network means:
- I can read anything that's not encrypted
- Usernames/passwords
- Your email
- Your chat messages
- Once I have that, the sky is the limit...
Defense: Encrypt anything that requires authentication
- Regular Email
- Web mail
- FTP/SSH/telnet
Notes:
Every time you get your email, you send your credentials to the mail server. If this connection is unencrypted, anyone who is on the same network with you (e.g. the same wireless access point), can read your credentials and then impersonate you.