Archives: Theory
Hacking and Malware
Hacking Hacking is the illegal access to a computer system without the owner’s consent or knowledge. In an age of networks that never sleep, hacking can be done remotely from anywhere. Hacking poses a real threat to people…
Proxy Servers
Proxy servers act as an intermediary between a user and a web server. Proxy servers have the following main functions: Using cache, they can speed up access to a website by storing the pages after the…
Firewalls
Firewalls are security systems designed to prevent unauthorised access to or from your computer or private network. Firewalls can be implemented in hardware, software or a combination of both. Firewalls sit between the user’s computer and…
The Need for Security
Whether it be personal or commercial, data is really valuable so it is important to keep it safe. Data is sometimes deleted or corrupted accidentally, but this can also happen as the result of malicious actions. Either…
Serial and Parallel Data Transmission
Data transmission can occur in two modes (methods), either serial or parallel. Serial data transmission In serial data transmission, bits are sent sequentially (one after the other) down the same wire (channel). Using a single…
Phishing
Phishing is the attempt to gain personal and sensitive information (usernames, passwords, financial details) for a malicious purpose. Phishing scams usually involve the receipt of a spoof email where the criminal impersonates a trustworthy and…
Free Software, Freeware and Shareware
Computer software is subject to copyright laws in order to protect its authors and provide them with fair compensation for their hard work. Without payment, there would be no incentive for programmers to spend years…
Operating System
An operating system (OS) is the computer program (software) responsible for the operation and smooth running of a computer. Most general purpose computers (including smartphones and tablets) will have an operating system to manage the running of…
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