The Mathematics of Modern Computerized Cryptography
Cryptography has been used for thousands of years to provide
security for messages. It is only during the twentieth century
that encryption came to be viewed as essentially a mathematical
process.
Much of this change can be traced back to Professor Lester S. Hill's
work which was published in the American Math Math Monthly. In 1929 he
published the article "Cryptography in an
Algebraic Alphabet".