Here we go:
#1: Encrypt Data Communication
#2: Minimize Software to Minimize Vulnerability
#3: One Network Service Per System or VM Instance
#4: Keep Linux Kernel and Software Up to Date
#5: Use Linux Security Extensions
#6: User Accounts and Strong Password Policy
#7: Disable root Login
#8: Physical Server Security
#9: Disable Unwanted Services
#10: Delete X Windows
#11: Configure Iptables and TCPWrappers
#12: Linux Kernel /etc/sysctl.conf Hardening
#13: Separate Disk Partitions
#14: Turn Off IPv6
#15: Disable Unwanted SUID and SGID Binaries
#16: Use A Centralized Authentication Service
#17: Logging and Auditing
#18: Secure OpenSSH Serv
#19: Install And Use Intrusion Detection System
#20: Protecting Files, Directories and Email
READ MORE : http://www.cyberciti.biz/tips/linux-security.html
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