Fast selective encryption scheme for MP3 files - Using GRAIN Stream Cipher

This paper explores the possibility of fast encryption of compressed audio data so as to be used in real time, information-sensitive audio transmission. To this end MP3 files were used as compressed audio files and some characteristic of the MP3 frames have been exploited to selectively encrypt the side information instead of whole data through stream cipher. The proposed scheme processes fast and hence is more congenial to real time audio transfer. The results to substantiate the claim of being faster than the usual way of encryption have been furnished here. And a detailed analysis of the security claim has been furnished here too.