Module 09 · Section 1.3.2

Encryption

Encryption is the process of scrambling data into an unreadable format (ciphertext) using a mathematical key.

HOW IT WORKS
Original data (plaintext) is scrambled into ciphertext using an algorithm and a key.
SYMMETRIC ENCRYPTION
The same key is used to both encrypt and decrypt. Efficient for large volumes of data.
Encryption Key (Example)
0x4F8E2A91C3B7D05E6F1A2B3C4D5E6F70
⚠ The Most Critical Examiner Warning
Encryption does NOT prevent interception. A hacker may still capture the data. The point is it is unintelligible/meaningless without the key.
← Previous: Media
PLAINTEXT
HELLO J277
👤 Attacker intercepts this data
HELLO J277 — readable!
State: Unencrypted plaintext