Signal encrypted chat app adds video calls, iOS users beware

At the height of the great Snowden whistleblowing phase of history, highly secure and encrypted messaging services became en vogue. While some of that has died down, a notable few like Signal remain. Developed by Open Whisper Systems, which also developers the Signal protocol now used by Whatsapp for encryption, the Signal app started out as a simple, text-based chat app. Now it is on the cusp of its next evolution, adding that oh so popular video chatting capability, though still in beta format.