Computer Security
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Computer security involves protecting systems from threats like viruses, worms, Trojan horses, and hackers through mechanisms like cryptography, digital signatures, and firewalls. Key aspects of security include availability, integrity, and confidentiality of data and systems. Common malicious software include viruses that replicate and infect files/boot sectors, worms that spread through email/networks to perform destructive actions, and Trojan horses that are hidden in downloads to act like viruses or worms.
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Computer Security
- 1. Computer Security “An overriding concern” 1
- 4. What are security threats? Malicious Code Malicious Programs Hackers Crackers 4
- 6. Virus Programs designed to replicate Usually have extensions like .exe, .com, .bat etc. 6
- 7. Types of Virus 7 • Affects master boot record • Infects rapidly • Difficult to remove Boot Sector • Infects .com & .exe • Replicates itself File Infecting
- 8. Worms Programs to perform destructive computer processing Use network connection to spread 8
- 10. Trojan Horses A destructive program Usually present in downloadable files Performs like virus and worms 10
- 11. Stay Protected “use protection medium” 11
- 13. Cryptography13 Simply hiding original information from third party Converts information to unreadable format for hackers and crackers.
- 14. Cryptography techniques14 SKC • Single Key • En/de-cryption PKC • Two keys • En/de-cryption Hash Functions • No keys • As password
- 15. Digital Signature15 Digitized form of paper signature Verifying electronic documents
- 16. Firewall Medium, software, system ,device. Control over Networks 16
- 18. What is security awareness? 18
- 19. What is security policy? 19