This [0] may of interest to people implementing secure IM. Instead of creating an IM app from scratch and hoping for wide adoption, babelcrypt is a keyboard app. One installed an an android smartphone, the keyboard passes encrypted data to an existing IM app such as whatsapp or Fb messenger. Using certain android APIs, it can also access content on the screen to display received messages.
[0] http://www.iseclab.org/people/mweissbacher/publications/babelcrypt_fc.pdf
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