Decipherment of Secret Writing

Abstract

Secret Writing is the means of written communication that is hidden and cannot be seen by naked eyes; thus, require few developing methods. The purpose of secret writing is to make the written text unreadable by another person who is exposed to the message.

History - Secret writing is being used since the middle of the Twentieth century for hiding message. It was a source of communication for Prisoners. They used their Saliva or Sweat and sometimes Urine also as invisible ink to write the message. These writings were also used by the government during the times of war. In that era, Magnifying glass and Direct light were used to detect the hidden message, but later on, many other developing methods were introduced including both physical and chemical methods.