Encryption
Domain: Computer Systems
🎯 Motivation
Scrambling data so only authorized parties can read it. Used for security everywhere.
📋 Concrete Example
Encryption: Hello -> encrypted -> Xj7#kQ9m. Only someone with the key can decrypt it back to Hello. Without the key, it is gibberish.
🔗 Analogy
Encryption is like a secret code - you write ‘meet at noon’ as ‘zrrg ng abbA’. Only your friend with the codebook (key) can read it. Everyone else sees gibberish.