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[ADD] xiao steganography 

Added xiao steganography link to the audio steg portion. Please review the changes made.
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Archisman Ghosh 2021-04-08 19:54:49 +05:30 committed by GitHub
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@ -462,6 +462,11 @@ exiftool -b -ThumbnailImage my_image.jpg > my_thumbnail.jpg
Some classic challenges use an audio file to hide a flag or other sensitive stuff. SONIC visualizer easily shows you [spectrogram](https://en.wikipedia.org/wiki/Spectrogram). __If it sounds like there is random bleeps and bloops in the sound, try this tactic!__
* [XIAO Steganography](https://xiao-steganography.en.softonic.com/)
Being a Windows-specific tool, it is often used in CTFs to hide flags inside audio files. __Take a look if the challenge has some odd strings which might resemble passwords.__
* [Detect DTMF Tones]
Audio frequencies common to a phone button, DTMF: [https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling](https://en.wikipedia.org/wiki/Dual-tone_multi-frequency_signaling).