A Standard MIDI File Steganography Based on Fluctuation of Duration

This report proposes a standard MIDI file steganography based on fluctuation of duration. Steganography is an application of information hiding technology, and it enables communication secrecy. Although SMF steganography which uses SMF as cover media is also proposed, there is an assignment that increase of embedding payload is difficult on conventional technique. In the proposed method, a secret message is embedded in different components by conventional methods, that is, the proposed method does not use MIDI message itself for expression of embedding information, but uses fluctuation which is added by a player or producer, and is included in SMF. In this report, details of the proposed method, and evaluation results of embedding capability and sound quality are described. In experimental simulation with the proposed method, it turned out that sound quality deteriorates hardly when information is embedded in SMF. Moreover, it is confirmed that the embedding capability of the proposed method improved to about 1.5 to 2.1 times as compared with the conventional method.