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Hardening tools - crack
- Helps maintain password policies.
- Kerberos
- More secure form for network authentication.
- PGP
- For encrypting files and verifying signatures.
- ssh
- Replace Telnet with SSH for secure remote logins.
- tcpwrappers
- Access control and logging for generic TCP connections.
- tripwire
- Detects when files have changed, which often is a sign of hacker activity.
- md5
- Checks to see if files have been corrupted, either unintentionally or intentionally.
Monitoring tools - netcat
- Helps debug text-based protocols.
- nfswatch
- Monitor NFS and RPC activity on your servers.
- tcpdump
- Command-line utility for sniffing traffic.
- top
- Helps flush out runaway processes.
- traceroute
- Maps the route through your network.
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