I'm working on this app for my final year dissertation. It performs Echo Steganography on wave files. My app uses this to encode short text messages in an audio file, then share it. I've just got the Steg side of things working, so...
Could you let me know the length of the string. Were the wrong characters at the end or distributed throughout? What kind of audio input were you testing with (voice message, background noise, music etc.)?
I've uploaded a new version, it's a bit more stable and a bit easier to use!
The app records a file from the microphone and embeds a secret message into it. You can send that file to someone, and if they've got the same app they can extract the secret message from the audio file. Anyone listening to the audio file wouldn't...