Private Conversations allows users to conduct end-to-end encrypted Skype audio calls between two people, and send text messages or files like images, audio, or videos between them. Now this feature is only being rolled out to Skype users who have enrolled as Insiders for iOS, Android, Mac, Linux and Windows Desktop. Naturally, both parties in a conversation must be running a supported Skype version for the feature to be usable.
In order to further protect privacy, Private Conversations will not be shown in Chats or in any form of notification. "After the recipient accepts your invite, all calls and messages in that conversation will be encrypted end-to-end until you choose to end it", Microsoft says. Skype, a worthy competitor to those services, has been lacking in this department.
Private Conversations are specific to a device.
Microsoft's Skype was one of the most popular video calling app a few years ago, though it is still very popular but is facing a tough competition from its competitor. The feature is made possible via Signal Protocol's encryption, though it isn't available to non-Insiders at this time.
Currently, only Skype Insiders are able to try out Private Conversations for themselves. Private conversations should roll out to non-Insiders in the coming weeks, though it's not clear yet when it will be available in the Skype UWP app. They can only send emoticons, files, and audio messages from the chat window. Microsoft has released this feature in the preview for Skype Insiders only.