Modern Ecryption Standard (MES): Version-II

In the present paper the authors have introduced anew symmetric key cryptographic method called Modern encryption Standard (MES) Version-II. Nath et. al already published Modern Encryption Standard version-I(MES-I). In the present method the authors have used Modified generalized Vernam cipher method with feedback with different block size from left to right and after that entire content is divided into two files and then combine them by taking 2^nd half first and the 1^st block. The generalised modified Vernam Cipher method again applied from left to right with different block sizes. The authors have used the present method on various types of plain text files and the result shows the method is free from standard cryptography attacks namely brute force attack, known plain text attack and differential attack. MES -II can be used as independent encryption algorithm to encrypt any short message such as SMS, Password or encryption key etc.