Digital Technology Essentials: Coding, GPS, and Network Security

Miniaturized Electronics & Efficiency

Miniaturized electronics, particularly semiconductor components, significantly reduce production costs and energy consumption.

Fundamentals of Digital Coding

Digital coding organizes signals into packages of a fixed number of bits. Each possible combination of eight zeros and ones represents a specific message.

Digitalization: Image Processing Basics

The digitalization technique divides an image into tiny squares, each called a pixel. A higher number of pixels results in higher resolution. Each pixel is assigned a luminous intensity value between 0 and 255. For color images, three different light intensities are used for each pixel: red, blue, and green. The number of values for each color component is also typically 256. Finally, a binary code converts these luminous intensity values into ones and zeros.

How Global Positioning Systems Operate

The operation of GPS requires three elements:

• A set of satellites orbiting Earth at a great height.
• A network of stations on the Earth's surface.
• An electronic receiver placed on a mobile device to determine its coordinates at any time.

Advantages of Universal Communication Networks

The vast universal communications network has two important characteristics:

• It allows electronic interconnection between two devices anywhere in the world.
• It supports sending signals between two devices via several routes. Digital technology chooses the best route for faster transmission.

Securing Network Information Exchange

Key Features of Information Protection

• The message is transmitted only to be understood by an authorized person or group of people (Confidentiality).
• The recipient knows who sent the message, and the sender cannot deny having sent it (Authentication/Non-repudiation).
• Decoding the message without the correct key is extremely complicated (Integrity/Confidentiality).

Understanding Digital Encryption

Digital encryption involves modifying a sequence of zeros and ones into another sequence, such that:

• The original sequence is not easily interpretable by any unauthorized user.
• The procedure used contains a secret known only to the intended recipients of the message.
• The second sequence, known as the encrypted message, can only be interpreted by those who know the secret part of the procedure.