Index based symmetric block encryption

Based on the principle of symmetric key encryption we present a new method of symmetric block encryption using indices called Index-Based Symmetric Block Encryption. Instead of going through a number of tedious rounds while encrypting the data, the data can be encrypted in just two rounds. Also, no two identical data blocks have the same ciphers, i.e. if a single block has been encrypted twice we don´t get identical ciphers. There by avoiding linear cryptanalysis and chosen cipher text attack. Encrypting the same document twice doesn´t yield the same set of ciphers.