TheCodeBreakers
Effective cryptography deliberately establishes special rules of
communication that deny information to those who would otherwise
understand the messages.
This withholding of information constitutes the essential element of
that which is called "secrecy." All the manifestations of secrecy—hiding
places, disguises, locked doors— share the basic idea of not
communicating objects or information. Its extreme form is silence (which
conjures up an Orwellian nightmare of the extreme form of
eavesdropping—detection and interpretation of brain waves). An
exhaustive investigation of the concept of secrecy would require, as
Maurits de Vries has pointed out, "a complete examination of the
relations between individuals and be-tweea groups in our society,"
because secrecy is the antithesis of communication, and
communication—as that which makes man a social being—encompasses
all aspects of cultural behavior. Cryptography combines these antitheses
annaabi.ee 
