Manual encryption practices, making use of codebooks, letter and quantity substitutions, and transpositions can be found in writings of this Spartans, Julius Caesar, Thomas Jefferson, and Abraham Lincoln.

Manual encryption practices, making use of codebooks, letter and quantity substitutions, and transpositions can be found in writings of this Spartans, Julius Caesar, Thomas Jefferson, and Abraham Lincoln. Cryptography has often been found in wartime, and critical victories (such…