IN THIS ARTICLE WE ARE GOING TO COMPARE USEFUL CRYPTOLOGY ALGORITHM IN DIFFERENT AREA AND EXPLAIN THEM THOUGH APPLICATION OF ALOGRITHMS HAVE VERY LARGE AREA BUT DOING SOME COMPARISON READER CAN DO DECISION OF USAGE OF INTRODUCED ALGORITHM IN RIGHT PLACE. IN THIS ARTICLE FIRST WE MENTION IMPORTANT POINT OF, DIGITAL SIGNATURE AND DISTRIBUTION KEY AND THEN WE COMPARE TOW CRYPTOLGY ALGORITHM ,PGP AND FORTPZA.