Microsoft has teamed up with encrypted communication company Signal to bring end-to-end encryption support to Skype messenger. Signal Protocol is an open source cryptographic protocol that has become an industry-wide standard. The new feature, dubbed Private Conversations, is already available to the program, which allows Skype users to test new features before they rolled out to the rest of its 300 million of users worldwide. Unlike WhatsApp, the feature is not enabled by default in Skype and users need to select ‘New Private Conversation’ from the app’s “Compose” menu to initiate a secure communication.
Source: https://thehackernews.com/2018/01/skype-encrypted-calls.html