Developing mobile message security application using 3D Playfair Cipher algorithm

The theme of this research is to provide security for the messages of an Android phone that contains alphabets, numerals and special characters. This research overrules the functioning of Application Lock and secures the messages by encrypting through 3D-Playfair Cipher(4 × 4 × 4). 3D-Playfair works on trigraph and supports all of the 26 alphabets {A to Z}, the 10 digits {0 to 9} and the 28 basic special characters. 3D-Playfair increases the security by maximizing complexity. Using this application, all the messages will be displayed in the encrypted form on the mobile screen which can be decrypted upon the verification of valid user.