Bit Level Generalized Modified Vernam Cipher Method with Feedback

The present paper discusses how the vernam cipher method can be extended to a new symmetric key cryptographic method called Bit Level generalized modified vernam cipher method with feedback. Nath et al already developed a method called BLES version-I where they have used extensive bit level permutation 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 modified vernam cipher method. using random key generator. The authors have 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 of brute force attack.