Good news for Skype users who are concerned about their privacy.
Microsoft is collaborating with popular encrypted communication company Signal to bring end-to-end encryption support to Skype messenger.
End-to-end encryption assured its users that no one, not even the company or server that transmits the data, can decrypt their messages.
Signal Protocol is an open source cryptographic protocol that has become an industry-wide standard—which is used in Apple iMessage, Facebook Messenger, Whatsapp, and Google Allo for secure messaging.
source : https://thehackernews.com/2018/01/skype-encrypted-calls.html