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Security

Security. File Security. User-level protection Protect personal files Three ways of protection password-based encryption-based access right. Password protection. Login and password Login names are public /etc/passwd passwd yppasswd, nispasswd. Encryption.

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Security

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  1. Security

  2. File Security • User-level protection • Protect personal files • Three ways of protection • password-based • encryption-based • access right

  3. Password protection • Login and password • Login names are public • /etc/passwd • passwd • yppasswd, nispasswd

  4. Encryption • Covert (encrypt) a file to a different form • Use gpg • gpg --gen-key • generates private & public keys • ~/.gnupg • encrypt & sign emails and files

  5. System security • Everyone is under threat • Specially when using Internet • Local threats also • Common sense, good practice • Err on the side of caution

  6. Some threats • Denial of Service (Dos) • Intrusion • Snooping • Viruses, Worms & Trojans • Rootkits

  7. Initial steps to security • shut down unwanted daemons • netstat -an • /etc/services • kill unwanted daemons • remove from init • changing access permissions to needed services

  8. Best Practices • Complex passwords • Skip the root account • Don’t trust random binaries • strace, ltrace • Log files • /var/log/syslog etc. • Software update • Physical security

  9. Firewall • Packet filtering • Stateless / stateful filtering • netfilter / iptables • Firewall products • Firestarter, Smoothwall Express, IPCop, Shoreline

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