Transcript Network and Dial

Security Issues
Introduction.
Security
• All the connectivity schemes you will
hear about have security implications.
– 4 computer security incidents in 2000
– 6 computer security incidents in 2001
• Firewall is absolutely crucial.
– Continual ‘scans’
– During Code Red - ‘thousands per second’
Security Comes From….
• Firewall
– only limited protocols allowed in to selected systems.
• Anti-Virus Software on all vulnerable systems.
– E-mail scanned on and before Exchange servers.
• Good system management procedures
– Applying patches/fixes
– Checking for unexpected changes
– Tight security settings
• Good user practice
Example (1)
Nimda virus
Spread by:
• E-mail
• Web browsing
• Web server worm (‘code red’)
• Network shares
Example (2)
How Microsoft was Hacked
• Member of staff received infected by email received at home.
• Home PC infected and passed account
details to hackers
• Hackers have valid username/password
to enter Microsoft’s site.
ISDN
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RAL does have ISDN capability.
BT ‘missed the boat’
Fast call set-up and use of demand dial.
Provides link to Boulby mine.
Security Considerations for
Home PCs
• Requirement to have both up-to-date
anti-virus and a personal firewall.
• See:
http://www.cleo.clrc.ac.uk/off-site.htm
• Proposed firewall is ZoneAlarm Pro.