Abstract
In this paper, we modify the audio files recorded by IOS “Voice Memo” by cutting and erasing them in the software, and use various software and websites to authenticate the audio files originality by taking the method of graphical analysis and metadata feature analysis of the files. By comparison, we find out the differences of the original and modified audio files and the general method of judging the originality of audio files. The results of the experiments show that the audio files generated by the IOS system's own voice memo are in M4A format by default and that the audio files generated in the IOS system environment have the important feature of system version information encoding.
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