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The playfair cipher operates on pairs of letters. The cipher text is broken into group of blocks, each block contains two letters.

Encryption and decryption cipher depends on key search, which is a square matrix that contains 5x5 letters. The matrix contains every letter expect letter j. In this paper the cryptanalyst a playfair is presented using search techniques. It is a Memetic Algorithm, another method is used to know a key through a correct Digram letters, which is used as an essential factor in the cryptanalyst cipher text. Results without memtiec algorithm and with it have been compared, to see which one has a best solution.