Session is an open-source, public-key-based secure messaging application which uses a set of decentralised storage servers and an onion routing protocol to send end-to-end encrypted messages with minimal exposure of user metadata. It does this while providing the common features expected of mainstream messaging applications, such as multi-device syncing, offline inboxes, and voice/video calling.

翻译：Session是一款基于公钥加密的开源安全消息应用，它通过去中心化存储服务器组与洋葱路由协议实现端到端加密消息传输，同时将用户元数据暴露降至最低。该应用在实现多设备同步、离线收件箱、语音/视频通话等主流消息应用常规功能的同时，确保了上述隐私保护特性。