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Lecture E-commerce and e-business for managers - Chapter 7: Computer and network security

Chapter 7 - Computer and network security. This chapter includes contents: Ancient ciphers to modern cryptosystems; secret-key cryptography; public key cryptography; key agreement protocols; key management; digital signatures; public key infrastructure, certificates and certification authorities; cryptoanalysis; security protocols. | Chapter 7 – Computer and Network Security Outline 7.1 Introduction 7.2 Ancient Ciphers to Modern Cryptosystems 7.3 Secret-key Cryptography 7.4 Public Key Cryptography 7.5 Key Agreement Protocols 7.6 Key Management 7.7 Digital Signatures 7.8 Public Key Infrastructure, Certificates and Certification Authorities 7.9 Cryptoanalysis 7.10 Security Protocols 7.10.1 Secure Sockets Layer (SSL) 7.10.2 Secure Electronic Transaction™ (SET™) 7.11 Security Attacks 7.12 Network Security 7.12.1 Firewalls 7.12.2 Kerberos 7.12.3 Biometrics Chapter 7 – Computer and Network Security Outline 7.13 Steganography 7.1 Introduction Internet security Consumers entering highly confidential information Number of security attacks increasing Four requirements of a secure transaction Privacy – information not read by third party Integrity – information not compromised or altered Authentication – sender and receiver prove identities Non-repudiation – legally prove message was sent and received Availability Computer systems continually accessible 7.2 Ancient Ciphers to Modern Cryptosystems Cryptography Secures information by encrypting it Transforms data by using a key A string of digits that acts as a password and makes the data incomprehensible to those without it Plaintext – unencrypted data Cipher-text – encrypted data Cipher of cryptosystem – technique for encrypting messages Ciphers Substitution cipher Every occurrence of a given letter is replaced by a different letter 7.2 Ancient Ciphers to Modern Cryptosystems Transposition cipher Shifts the ordering of letters Modern cryptosystems Digital Key length – length of string used to encrypt and decrypt 7.3 Secret-key Cryptography Secret-key cryptography Same key to encrypt and decrypt message Sender sends message and key to receiver Problems with secret-key cryptography Key must be transmitted to receiver Different key for every receiver Key distribution centers used to reduce these problems Generates session key and sends it to sender and | Chapter 7 – Computer and Network Security Outline 7.1 Introduction 7.2 Ancient Ciphers to Modern Cryptosystems 7.3 Secret-key Cryptography 7.4 Public Key Cryptography 7.5 Key Agreement Protocols 7.6 Key Management 7.7 Digital Signatures 7.8 Public Key Infrastructure, Certificates and Certification Authorities 7.9 Cryptoanalysis 7.10 Security Protocols 7.10.1 Secure Sockets Layer (SSL) 7.10.2 Secure Electronic Transaction™ (SET™) 7.11 Security Attacks 7.12 Network Security 7.12.1 Firewalls 7.12.2 Kerberos 7.12.3 Biometrics Chapter 7 – Computer and Network Security Outline 7.13 Steganography 7.1 Introduction Internet security Consumers entering highly confidential information Number of security attacks increasing Four requirements of a secure transaction Privacy – information not read by third party Integrity – information not compromised or altered Authentication – sender and receiver prove identities Non-repudiation – legally prove message was sent and received Availability .