IT402: Network Security Course Overview

Course Overview

• The course is IT402: Network Security, taught by Prof. Dr. Walid Khedr at the Department of Information Technology, Faculty of Computers & Informatics, Zagazig University.
• The course covers information and network security concepts, cryptography, and network security topics.
• The course has prerequisites of Computer Networks and Internet Programming.

Information Security, Cybersecurity, and Network Security

• Information security refers to the preservation of confidentiality, integrity, and availability of information, as well as other properties like authenticity, accountability, nonrepudiation, and reliability.
• Cybersecurity deals with measures and actions taken to prevent unauthorized access or manipulation of cyber resources within cyberspace.
• Network security refers to the protection of networks and their services from unauthorized modification, disclosure, or destruction, and protecting data during transmission.

Security Objectives

• The three key objectives of information and network security are:
• Confidentiality: protecting data from unauthorized access or disclosure
• Integrity: ensuring data and system integrity and authenticity
• Availability: ensuring systems and services are accessible and usable when needed
• Additional objectives include:
• Authenticity: ensuring the identity of a digital object or entity
• Nonrepudiation: providing proof of data origin and receipt
• Accountability: tracing actions to individual entities for security breaches

Security Architecture

• The ITU-T Recommendation X.800 defines a security architecture for OSI, which includes security attacks, threats, security services, and security mechanisms.
• Security attacks can be passive (e.g., eavesdropping) or active (e.g., tampering).
• Security services include authentication, access control, data confidentiality, data integrity, and nonrepudiation.
• Security mechanisms include cryptography and other processes to detect, prevent, or recover from security attacks.

Security Violations

• Examples of network security violations include:
• Unauthorized access to sensitive information
• Interception and alteration of messages
• Unauthorized modification of authorization files
• Delaying or intercepting messages to gain unauthorized access

Cryptography

• Cryptography is a critical component of network and communications security, used to protect data confidentiality, integrity, and authenticity.
• Cryptography involves the use of algorithms and secret keys to transform plaintext into ciphertext.

Topics Covered in the Course

• The course covers topics including:
• Classical encryption techniques
• Block ciphers and the Data Encryption Standard (DES)
• Advanced Encryption Standard (AES)
• Symmetric ciphers, stream ciphers, and public-key cryptography
• Hash and MAC algorithms, digital signatures, and key management
• Network security topics, including transport-level security, blockchain protocol, Tor protocol, wireless network security, IP security, and SET protocol.

This quiz is about the course overview of Network Security (IT402) at Zagazig University's Faculty of Computers & Informatics. It covers the introduction to the course, lecturer details, and course information.