What is Security Mechanism? List Any Two Approaches.

Security mechanism is any method, tool, or procedure designed to detect, prevent, or recover from a security attack and enforce the security policy of a system.

Explanation:

Security mechanisms are the building blocks used to implement security services like confidentiality, integrity, and authentication in a computer system or network.

Two Approaches of Security Mechanisms:

A. Specific Security Mechanisms:

• These are implemented in a specific protocol layer to provide specific security services.
• Examples: Encryption, Digital Signatures, Access Control Lists, Authentication Exchange

B. Pervasive (General) Security Mechanisms:

• These are not specific to any particular service or protocol layer; they are general in nature.
• Examples: Trusted Functionality, Security Labels, Event Detection, Security Audit Trail

Conclusion: Security mechanisms act as the technical foundation to protect systems from unauthorized access, modification, or denial of service.

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1. Discuss the Different Types of Software with Example

Software is a set of instructions or programs that tell the computer what to do and how to perform tasks.

Types of Software:

A. System Software:

• Software that manages and controls computer hardware and provides a platform for application software.
• It acts as an interface between user and hardware.
• Examples: Windows OS, Linux, macOS, Device Drivers, BIOS

B. Application Software:

• Software designed to help users perform specific tasks or activities.
• It runs on top of system software.
• Examples: MS Word, Google Chrome, Adobe Photoshop, VLC Media Player

C. Utility Software:

• Software designed to help manage, maintain, and optimize the computer system.
• It performs housekeeping tasks.
• Examples: Antivirus (Norton), Disk Cleanup, WinRAR, File Manager

D. Malicious Software (Malware):

• Software intentionally designed to cause damage, steal data, or disrupt system operations.
• Examples: Viruses, Worms, Trojans, Ransomware, Spyware

Conclusion: Software is broadly categorized based on its purpose — system software runs the machine, application software serves the user, utility software maintains the system, and malware is designed to harm it.