Passcode Private chat app Telegram may not be as secretive as advertised

Telegram promotes itself as a private chat application. But a security firm says it uncovered a flaw that can reveal a message even after is has supposedly been deleted permanently. 

Melanie Stetson Freeman/Staff

The popular messaging app Telegram touts end-to-end encryption as one of its primary features, but may not be as secure as its 50 million users might think.