Description: Use audiomark to embed secret data into ".wav" files! Unfortunately only available to linux users, audiomark allows you to embed a string of data into a wav file via the "embed" command. You can then check to see if your friends got the same wav file from you by testing it with the "test" command!
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File list (Check if you may need any files):
audiomark-master
................\Makefile
................\README
................\audio
................\.....\11kulaw.wav
................\.....\5000.wav
................\.....\8000.wav
................\.....\ghostbustersray.wav
................\.....\ghostbustersray_new.wav
................\.....\immut.wav
................\.....\input.wav
................\.....\orig_out.wav
................\.....\out.wav
................\.....\out1.wav
................\.....\out2.wav
................\.....\test.wav
................\.....\voice.wav
................\audio_watermark.pdf
................\detect.c
................\embed.c
................\gen_audio.c
................\my_psycho.c
................\my_psycho.h
................\spectrograms
................\............\440.png
................\............\440_FH.png
................\............\440_FH_plus.png
................\............\440_FH_plus_weak.png
................\............\440_SS.png
................\............\440_SS_plus_weak.png
................\............\9000.png
................\............\compressed_ghost.png
................\............\hi_wave.png
................\............\higher_wave.png
................\............\spectrogram.png
................\............\uncompressed_ghost.png
................\............\wave.png
................\test.c
................\w_array_ops.c
................\w_array_ops.h
................\watermark.c
................\watermark.h
................\wmark.cfg
................\wrandom.c
................\wrandom.h