What You'll Learn
- Data Transfer & Passwords: How data moves through networks safely
- Authentication Methods: Ways to verify a user is who they claim to be
- Anti-Malware Software: How to protect devices from viruses
- Video-Conferencing: Real-time face-to-face digital meetings
- Audio-Conferencing: Voice-only remote communication
- Web-Conferencing: Interactive online meetings with collaboration tools
Data Transfer & Passwords
Why Is Data Transfer a Network Issue?
Every time you send a message, upload a file, or log into a website, data is moving across a network. This journey makes it vulnerable. Think of it like sending a postcard through the mail — anyone handling it could read what's written. Data transfer poses potential security risks including:
- Unauthorised access — someone reads data they shouldn't
- Data manipulation — someone changes the information
- Data theft — someone copies and steals sensitive information
Common Causes of Data Transfer Security Risks
Understanding the risks helps you understand why we need protection methods:
| Cause |
What Happens |
| Hackers |
Exploit network weaknesses to access, delete, or steal confidential data |
| Insider threats |
People inside the organisation (intentionally or accidentally) compromise security and steal/intercept data |
| Social engineering |
Manipulating users into revealing secrets or clicking malicious links that install malware |
| Unencrypted transfers |
Sending sensitive data without any encoding or protection |
| Weak encryption |
Using outdated or weak encoding methods that hackers can break easily |
| Insecure protocols |
Using HTTP (unencrypted) instead of HTTPS (encrypted) for sensitive information like passwords |
Critical distinction: Always use HTTPS (not HTTP) when entering passwords, credit card info, or personal data online. That padlock symbol in your browser shows you're secure.
What Are Passwords?
Password
A digital lock — a secret code that prevents unauthorised access to an account. Passwords are usually stored as encrypted/ciphered text in a database. This means even if a hacker steals the database, they can't read the actual password (it's scrambled).
Think of a password like a physical key. The lock (your account) is useless if anyone can copy your key. So organisations don't store the actual key — they store a "fingerprint" of the key. Even they can't reverse it to find the original key.
How to Keep Passwords Safe
Three Essential Protections
- Use anti-spyware software to prevent keyloggers (programs that record what you type)
- Change passwords regularly so compromised passwords are detected and refreshed
- Create strong passwords that meet all four criteria