End-to-end encryption will work for all users of the latest version of Skype installed on devices based on Windows, iOS, macOS, Android and Linux. The option is not enabled by default, it needs to be activated in each new chat.
- To start an encrypted chat, you need to select a user from the contact list and click "Start a private conversation". The feature works if both parties have the latest version of Skype installed.
- All calls, messages and files are encrypted before the end of the conversation.
- End-to-end encryption works only in one conversation and only on the device where it is launched. When you move from smartphone to computer, for example, you will need to start a new chat room to ensure privacy. All previous correspondence will remain on the phone.
Microsoft has already reported on 256-bit AES encryption for Skype. Company started considering end-to-end encryption in the beginning of 2018. On January 12, Microsoft announced a partnership with Open Whisper Systems to create Skype chats protected by end-to-end encryption based on Signal's open source protocol.