Definition: Refers to telecommunication in which a wide band of frequencies is available to transmit information.
Because a wide band of frequencies is available, information can be multiplexed and sent on many different frequencies or channels within the band concurrently, allowing more information to be transmitted in a given amount of time (much as more lanes on a highway allow more cars to travel on it at the same time).
Related terms are wideband (a synonym), baseband (a one-channel band), and narrowband (sometimes meaning just wide enough to carry voice, or simply "not broadband," and sometimes meaning specifically between 50 cps and 64 Kpbs).
Definition: A type of encryption that uses a pair of keys, one public and one private, to encrypt data and verify its contents.
If you encrypt data with your private key, only people with your public key can decrypt it, and vice versa. Public keys, as you might expect, are often published.
on the - Talking Technology
with Leroy Jones,