Gene

Algorithm

Biology

Secrecy

Computer security

Theoretical computer science

Complement (music)

Biochemistry

Computer science

Complementation

Cryptography

Information-theoretic security

Phenotype

Bell System Technical Journal

THE problems of cryptography and secrecy systems furnish an interesting application of communication theory. <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">1</sup> In this paper a theory of secrecy systems is developed. The approach is on a theoretical level and is intended to complement the treatment found in standard works on cryptography. <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> There, a detailed study is made of the many standard types of codes and ciphers, and of the ways of breaking them. We will be more concerned with the general mathematical structure and properties of secrecy systems.

Communication Theory of Secrecy Systems*