History Of Information Security
Since the early days of writing, Heads of State and military commanders understood that it was necessary to provide some mechanism to protect the confidentiality of written correspondence and to have some means of detecting tampering.

Julius Caesar is credited with the development and use of the Caesar cipher c50 B.C. to prevent his secret messages from being read should a message fall into the wrong hands.

World War II brought about much advancement in information security and may mark the beginning of information security as a professional field. WWII saw advancements in the physical protection of information with barricades and armed guards controlling access into information centers. It also saw the introduction of formalized classification of data based upon the sensitivity of the information and who could have access to the information. In the same period, the concept of encoding and decoding of information came into existence and automatic ciphering machines were developed and used.

The rapid growth and advancement in the late 20th Century and early 21st Century strengthen the concepts of security and fueled the need for better methods of protecting and preserving the information which is stored, processed and transmitted.