1. A method of securing data in a computer network and transparently establishing and managing the separation of user-based communities of interest based upon crypto-graphically separated, need to know security levels, said data having one or more security sensitive words, data objects, characters or icons, said computer network having a plurality of computers interconnected together, one of said plurality of computers designated as a data input computer and each of said plurality of computers having a memory therein, a first and a second memory designated as a remainder store and an extract store in one or more computers of said plurality of computers, said user-based communities of interest representing a plurality of users having a corresponding a plurality of security levels each with a respective security clearance, comprising: filtering data input from said data input computer and extracting said security sensitive words, data objects, characters or icons from said data to obtain (a) subsets of extracted data and (b) remainder data; storing said subsets of extracted data and said remainder data in said extract store and said remainder store, respectively; and, permitting reconstruction of some or all of said data via one or more of said subsets of extracted data and remainder data only in the presence of a predetermined security clearance of said plurality of security levels.