Computer Security (CS4800)

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Presentation transcript:

Computer Security (CS4800) Survey Prepared by Dr. Lamiaa Elshenawy

Survey Book (CRYPTOGRAPHY AND NETWORK SECURITY PRINCIPLES AND PRACTICE, 5th edition, William Stallings) Computer security concepts OSI security architecture 1- Security Attacks 2- Security Services 3- Security Mechanisms Access Control Classical Encryption Techniques

Computer security concepts Confidentiality Data ----Privacy Integrity Data----System Availability Authenticity Accountability - CIA triad

OSI security architecture Security Attack Security Mechanism Security Service

Security Attack Security Attack Passive attacks Active attacks - not detect - easy prevent - detect - not prevent 1- Release of message contents 2- traffic analysis 1- masquerade 2- Replay 3- modification of message 4- denial of service

Security Services Security Services Authentication Access control Data confidentiality Data Integrity Nonrepudiation Availability

Authentication Exchange Security Mechanism Security mechanism Encipherment Digital signature Access control Data Integrity Authentication Exchange Traffic padding Routing Control Notarization

Symmetric Cipher Model Plaintext input 1- encryption algorithm 2- secret key Encryption Cipher text output Cipher text input 1- Decryption algorithm 2- secret key Decryption Plaintext output

Symmetric Cipher Model 1- Cryptography (enciphering) - Cryptology 2- Cryptanalysis (deciphering) - Cryptanalyst

Symmetric Cipher Techniques - Substitution techniques Caesar Cipher Monoalphabetic Ciphers Playfair Cipher Hill Cipher Polyalphabetic Ciphers (Vigenère cipher –Vernam cipher) One-Time Pad - Transposition techniques Rail fence

Symmetric Cipher Techniques - Rotor machines - Steganography Character marking Invisible ink Pin puncture Type writer correction ribbon

Thank you for your attention