this hill cipher, mona cipher, poly and play fair cipher technique in cryptography.it is used to encrypt multiple letters at a time.it is implemented in c++.at a time 1 or more than letters are encrypted and also can decrypted ..and runlength coding is also included .its is used for compressing the content-this is hill cipher, mona cipher, poly and play fair cipher technique in cryptography.it is used to encrypt multiple letters at a time.it is implemented in c++.at a time 1 or more than letters are encrypted and also can decrypted ..and runlength coding is also included .its is used for compressing the content