Module 4~9 min
Introduction to Encryption
Encryption is one of the fundamental tools that protects information as it's stored or sent across a network.
What You'll Learn
- What encryption does
- The basic idea of a key
- Why encryption matters for confidentiality
Scrambling Information
Encryption transforms readable information (plaintext) into an unreadable form (ciphertext) using a mathematical process, protecting it from anyone who doesn't have the means to reverse the transformation.
Keys
A key is the piece of information needed to encrypt or decrypt data. Without the correct key, ciphertext should be practically impossible to turn back into readable information.
Example
When a website uses HTTPS, it uses encryption so that even if someone intercepts the traffic, they see only unreadable ciphertext rather than your actual data.
Key Concepts
EncryptionPlaintextKey
Key Takeaways
- Encryption transforms readable data into unreadable ciphertext
- A key is required to encrypt or decrypt the data
- Encryption protects the confidentiality of stored and transmitted data
Knowledge Check
What is encrypted, readable data called before it's transformed?