whiten

Short definition from Wiktionary

Verb

1. 1
   (To cause) to become white or whiter; to bleach or blanch.
2. 2
   To increase the security of an iterated block cipher by steps that combine the data with portions of the key.
3. 3
   To normalize data so that the covariance matrix becomes the identity matrix; i.e., to remove correlations so each variable has unit variance.

Proper noun

1. 1
   A surname.