In the present work the authors introduced a new symmetric key cryptographic method for encryption as well as decryption of any file such as binary file, text file or any other file. Nath et. al.(1) developed an algorithm called MSA for encryption and decryption of any file using a random key square matrix containing 256 elements. The weak point of MSA algorithm is that if someone applies the brute force method then he has to give a trial for factorial 256 to find the actual key matrix. Now in the modern world this number of trial runs may not be impossible for the hacker. To get rid of this problem here the authors suggest a better algorithm than MSA. In the present method the authors considered the size of the key matrix to be 65536 and in each cell we store 2 characters pattern instead of 1 character unlike MSA method. If someone wants to give a brute force method to find our actual key then one has to give a trial for factorial 65536 runs! Theoretically this is an intractable problem. Moreover the authors have also introduced multiple encryptions here to make the system more secured. This method will be suitable in any business house, government sectors, communication network, defense network system, sensor networks etc. In the present work the authors have introduced a square key matrix of size 256 by 256 where in each cell there are all possible 2-lettered words (ASCII code 0-255). The total number of words possible is 65536. The key matrix is then randomized using the method proposed by Nath et. al(1). The user has to enter some secret text-key. The maximum length of the text key should be 16 characters long. To calculate the randomization number and the number of encryption to be done is calculated from the text-key using a method proposed by Nath et.al(1). The present method will be most suitable for encryption of a file whose size is less than or equal to 2MB. If the file size is very big then we suggest choosing small encryption number to speed up the sytem.

In the present paper the authors have introduced a new symmetric key cryptographic method called Bit Level Encryption Standard(BLES) which is based on bit exchanging or bit reshuffling method. The authors have introduced a completely new bit level encryption method. Nath et. al has already developed bit manipulation method called NJJSAA where the authors mainly used bit level right shift, bit level XOR operation. In the present paper the authors have used bit level exchange using random key generator and also byte level exchange using random key generator. The bit exchange was made using different block sizes such as 16 bits, 64 bits, 256 bits and 1024 bits long. To make the system hard the authors have changed the randomization matrix each time when data is extracted from plain text file and whenever the size of the block is changed. After finishing bit level exchange for the entire file the authors used the byte exchange method. The authors have also introduced a special bit manipulation method so the encryption algorithm will work even for all characters with ASCII Code 0 or all characters with ASCII Code 255. The standard encryption algorithm will fail to encrypt a file where all characters are ASCII '0' or all characters with ASCII '255' but the present method will be able to encrypt a file where all characters are ASCII '0' or all characters are ASCII '255'. The present method will be effective for encrypting short message, password, confidential key etc. The spectral analysis in the result sections shows that the present method is free from known plain text attack, differential attack or any type brute force attack.