Encryption is a method of converting information into a code to prevent unauthorized access. It keeps digital communication and data private and secure.

How it works:

• Uses mathematical algorithms and keys to scramble (encrypt) and unscramble (decrypt) messages.

• Two main types:

  • 1. Symmetric encryption (same key for encryption and decryption)

    2. Asymmetric encryption (public and private keys)

• Common algorithms: AES, RSA

Some of the many Applications:

• Garage door openers

• Health Care Systems

• Online banking and shopping (HTTPS)

• Messaging apps (WhatsApp, Signal)

• Secure login systems

• Protecting stored data on devices and in the cloud

Impacts:

• Essential for digital security and protecting personal and financial information.

• Enables trust in online systems and services.

• Helps journalists, activists, and citizens stay safe in oppressive regimes.

Problems or Issues:

• Can be used by criminals to hide illegal activity (e.g., ransomware).

• Governments may want access for security (backdoors), but this can weaken privacy for everyone.

• Quantum computing could break current encryption methods in the future.

Task 2 - Class discussion

Run through the main points, summerising the content on the CS Field Guide 

Refer to Dr Tim Bell's Webinar (aboe under Teacher Help) for some learning activites.