randomizer
1. A device used to invert the sense of pseudorandomly selected bits of a bit stream to avoid long sequences of bits of the same sense.
Note: The same selection pattern must be used on the receive terminal in order to restore the original bit stream.
2. [An] analog or digital source of unpredictable, unbiased, and usually independent bits. Randomizers can be used for several different functions, including key generation or to provide a starting state for a key generator. [INFOSEC-99]