Network Security Fundamental
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This document discusses network security. It covers the need for security, goals of security like integrity, confidentiality, authentication, non-repudiation and availability. It then discusses famous malware types like viruses, worms and trojan horses. Viruses attach to programs and run when the program runs, worms replicate endlessly without causing harm, and trojan horses provide unauthorized access. The document also covers phishing scams and cryptography techniques like encryption, decryption, symmetric and asymmetric key cryptography.
Network Security Fundamental
- 1. NETWORK SECURITY Ms. Mousmi Pawar
- 2. OVERVIEW 1. Need for Security 2. Goals of Security 3. Famous Malwares and Phishing 4. Cryptography
- 4. GOALS OF SECURITY Integrity Confendtiality Authentication Non-Repudiation Availability Access Control
- 5. INTEGRITY Protect the information INTEGRITY This type of attack is called Modification Transfer `1000 To B Ideal route of the message Transfer `1000 To C Actual route of the message A X
- 6. CONFIDENTIALITY Guarantee Data Confidentiality This type of Attack is called Interception. To:[email protected] ATM pin is 9876 X A
- 7. AUTHENTICATION Absence of proper authentication is called Fabrication. A I am user A Transfer `5000 to X X
- 8. NON-REPUDIATION Transfer `1000 To B I never requested to transfer `1000 to B A A
- 9. AVAILABILITY & ACCESS CONTROL This type of attack is called Interruption. username: [email protected] Password: ******** ----- ----- ----- ----- ----- ---- Read Read, Write Read
- 10. FAMOUS MALWARES Viruses Worms Trojan Horse
- 11. VIRUS A virus is a piece of program code that attaches itself to legitimate program code and runs when the legitimate program runs. Sum=a+b; Print sum; End. Sum=a+b; Print sum; Virus Code End. Original Code Original Code + Virus code Delete all files Send copy of myself to all using user’s address book. Virus code
- 12. WORM A worm does not modify the program, instead it replicates itself again and again. Resource eating and no destruction Resource eating and no destruction Resource eating and no destruction Resource eating and no destruction Resource eating and no destruction Resource eating and no destruction Resource eating and no destruction
- 13. TROJAN HORSE It provides the attacker with unauthorized remote access to a compromised computer, infects files and damages the system, or steals user sensitive information. username: [email protected] Password: ******** Trojan Program A X
- 14. X
- 15. PHISHING Attacker set up fake website which looks like real website to obtain your details.
- 16. CRYPTOGRAPHY Cryptography is the science of achieving security by encoding messages to make them non-readable. Encryption: The process of encoding plain text message into cipher text message is called as encryption. Decryption: the reverse process of transforming cipher text to plain text is called decryption.
- 17. CRYPTOGRAPHY MECHANISM Every Encryption and Decryption process has 2 aspects: the algorithm and the key used for encryption. Symmetric key Cryptography: If the same key is used for encryption and decryption.(e.g. DES) Asymmetric key Cryptography/Public Key Cryptography: if two different keys are used for encryption and decryption process(e.g. RSA)
- 18. REFERENCES Cryptography and Network Security, Atul Kahate, Tata McGraw Hill. http://en.wikipedia.org/wiki/Cryptography.- Wikipedia.
- 19. THANK YOU