Embed secret text messages in audio files for covert communication.

This app is being developed as part of my Part II Project in Computer Science at the University of Cambridge.

This app records audio, and embeds a secret text message into the audio file. You can then share the recording with others, who can extract the secret message with the same app. The messages can be encrypted with a password for extra security.

The app uses a process called Echo Steganography to embed the secret messages. The difference between an unencoded and encoded audio file is inaudible to the human ear, only complex steganalysis can determine whether the file has any data hidden in it. This method of data hiding is also resistant to transcoding between audio formats.

此版本中的新功能：

* Multicasting of messages to contact groups added

* Fixed bug with sharing files in paranoid mode

* Better memory management, should work more reliably with longer messages

* Reduced error rate (less garbled messages)

* Reduced file size by 33%

* Other bug fixes