Encryption is great. By magic (well, by math) it converts data from a useful form to complete gibberish that can only be turned back into useful data with secret number called a key.
I happen to think that the term “key” that we use for encryption and decryption keys is a poor metaphor, as it suggests unlocking a door or a box. Cryptographic keys are more like special magic wands that are essential to the process of transforming data from its useful (decrypted) form to gibberish and back again. Read more