Learn: Encryption as a Defence

Welcome!Welcome back! You've already learned about common security threats like malware, phishing, and data interception. Now, let's explore how encryption can protect data, both while it's being sent and when it's stored.

What is Encryption?Encryption is a way to protect data by converting it into a code, making it unreadable to unauthorised users. It ensures that even if data is intercepted or accessed, it cannot be understood without the decryption key.

Why is Encryption Important?Encryption is critical for keeping sensitive information safe, such as passwords, financial data, and personal messages. It helps protect data in transit (while being sent across a network) and at rest (stored on a device or server).

How Does Encryption Work?Encryption uses algorithms to scramble data into an unreadable format called ciphertext. Only someone with the correct decryption key can transform it back into its original form.

Symmetric vs Asymmetric EncryptionIn symmetric encryption, the same key is used to encrypt and decrypt data. In asymmetric encryption, there are two keys: a public key for encryption and a private key for decryption. Asymmetric encryption is often used for secure communication between parties.

Encryption in Transit and At RestEncryption in transit protects data as it is sent across a network, such as emails or online transactions. Encryption at rest secures stored data, like files on a hard drive or server, ensuring it can't be accessed without the key.

Review Time!Fantastic work! You've learned about encryption and how it protects data in transit and at rest. Now, let's test your understanding with a few review questions.