A way of encryptingEncryption refers to encoding and decoding (or encrypting and decrypting) data so that it can't be read unless you have the right key. It's critical for good security. data that uses one keyA number used to encrypt (or encode) information so that no one can read it. Keys are used when encoding and decoding. You shouldn't have to mess with keys yourself. for encrypting and another for decrypting.
Inside the Internet of Things - Bryon Moyer Blog