General
Secure network communication:
- Layer 7: GPG/PGP
- Layers 4,5: SSL/TLS/Stunnel/S/MIME
- Layer 3: VPN, IPsec
- Layer 2: PPTP
Packet sniffing:
- tcpdump, Wireshark
Attacks:
- Man in the middle attack
- land ping of death xmas Denial-of-service attack et al.
Read more about this topic: Unix Security
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