Brainlag PlusWhat encryption does, the Caesar cipher by hand, why it is easy to break, and how password length changes the work for an attacker.
Encryption
Encryption scrambles plaintext into ciphertext using a key.
Without the key, intercepted data is useless to an attacker. HTTPS, Wi-Fi (WPA2 and WPA3) and encrypted disks all use it.
Websites should not store passwords at all: they store a hash, a value worked out from the password that cannot be turned back. At login they hash what you type and compare.
The rest of this lesson and its 7 practice questions are in Plus.
Screen 1 of 3, free to read.
- 7 exam-style questions, marked as you go, each with a worked solution
- Anything you get wrong is saved to your flashcards