Cyber Security Fundamentals

1. Introduction to Cyber Security

Discover the essentials of cybersecurity in this section, where we unravel the core concepts. Gain insights into digital threats and learn how to safeguard your online presence. Get ready for a straightforward exploration of the cyber world!

What is Cybersecurity?

Common Cyber Threats

Malware

Phishing

DoS and DDoS attacks

Challenge: Check Password Strength

2. Web Cyber Security

Dive into the dynamic realm of Web Cyber Security, where we demystify the intricate layers of the OSI (Open Systems Interconnection) model. Uncover the vulnerabilities within each OSI block, gaining a profound understanding of the threats that lurk in the digital space. Explore the vital aspects of physical and software protection, arming yourself with the knowledge needed to safeguard web environments against potential risks and ensure robust cyber resilience.

OSI Model

Web Protocols

Challenge: Check Website Web Protocol

Examples of Cyber Attacks

Password Hashing

Challenge: Creating Hash Function

Security Headers

Challenge: Extracting Security Headers From Website

3. Information Encryption

In the digital world, security is crucial to protect sensitive information. Encryption is key in this defense, ensuring data remains private and safe from unauthorized access. Now, we will explore the basics of information encryption, its methods, and its vital role in maintaining the integrity and privacy of digital communication.

What is Information Encryption?

Caesar Cipher

Challenge: Implementing Caesar Cipher

XOR Algorithm

Challenge: Implementing XOR Encryption

XOR decryption

Challenge: Implementing Caesar Cipher

Task

Now, we will implement a simple function that provides data encryption using Caesar cipher.
Your task is to:

Check if the character is alphabetic inside the for loop of the caesar_cipher() function. Use the .isalpha() method to do it.
Set the value of the key variable equal to 3.
Call the caesar_cipher() and specify the required arguments (plaintext and key).

Note
To provide decryption, we can use the same function but with other arguments: caesar_cipher(encrypted_text, neg_key) where neg_key = - key.

Everything was clear?

Section 3. Chapter 3

Course Content

Cyber Security Fundamentals

Challenge: Implementing Caesar Cipher

Task

Now, we will implement a simple function that provides data encryption using Caesar cipher.
Your task is to:

Check if the character is alphabetic inside the for loop of the caesar_cipher() function. Use the .isalpha() method to do it.
Set the value of the key variable equal to 3.
Call the caesar_cipher() and specify the required arguments (plaintext and key).

Note
To provide decryption, we can use the same function but with other arguments: caesar_cipher(encrypted_text, neg_key) where neg_key = - key.

Everything was clear?

Section 3. Chapter 3