It has long been known that private information can be hidden in musical melody through some technical means (such as backmasking). For example, in the "Can You Hear" of Jay Chou, is it a lyric to the 2'11" to 2'15" lyrics? In fact, if you listen to it in reverse, it's a word. (Interested can be pouted at the end of the link)
Not long ago, a Polish researcher discovered a new coding method. He cleverly changed the rhythm of a particular dance, hidden information in the melody, and the human ear could not hear anything strange.
Ibiza dance music originates from Ibiza Island in the western Mediterranean, and the StegIbiza algorithm can hide information. Ibiza's dance music is characterized by its rhythm, and Professor Krzysztof Szczypiorski from Warsaw University of Technology in Poland used this feature to code. Prof. Szczypiorski replaced the rhythm of fast or slow beats in a particular rhythm with a combination of Morse code.
To test this idea, Professor Szczypiorski uses Apple’s Logic X Pro music production software to:
David A. Stewart & Candy Dulfer's "Lily was here"
Queen's "Miracle"
Snap!'s "Rhythm is a dancer"
Miles Davis's "So what"
Andrzej Zaucha's "You were the heart's beat"
Five songs were tested for information coding.
Five songs do not use digital, hip hop or psychedelic styles, and only use the optional instruments in Apple software. After this, Prof. Szczypiorski randomly inserted the message "steganography is a dancer!" in each of the five songs.
Prof. Szczypiorski began using his coding method to change the beat of the song little by little until the human ear could not discern. Prof. Szczypiorski then asked the testers to test their coding effects in a headset environment and a DJ-controlled outdoor acoustic environment. Prof. Szczypiorski found that less than 1% of people noticed changes in the beats in the songs.
This result shows that StegIbiza is a viable way to encode music information. Prof. Szczypiorski suggested that relevant coding software should provide coding and coding services while ensuring security. Prof. Szczypiorski's paper has been published. Interest can be read by clicking here .
Recommended reading:
Wikipedia: List of backmasked messages
After learning to write poetry, Google AI is now planning to challenge music, painting and video originality.