The remarkable growth of the Internet of Things (IoT) has given rise to application areas where it is crucial to secure the endpoints, to guarantee users privacy and even safety. In this context, secure group communication among low-cost devices is a fundamental and challenging research question. Namely, the limited computational resources of nodes, uncertain periods of connectivity, and potentially large number of connected devices make it impractical to apply established solutions to IoT settings. This paper specifies a security protocol, named Sharelock, that provides end-to-end security and confidentiality of messages exchanged by groups of communicating nodes. The protocol establishes long-term security for nodes communicating through untrusted edge servers and scales to large groups of nodes by using cryptographic primitives that are not only applicable to low-cost devices, but also suitable for post-quantum cryptography. The protocol is designed to support the exchange and storage of generic messages among nodes, thereby making it appropriate for a wide range of IoT applications.

物联网（IoT）的飞速发展已经引起了应用领域的发展，在这些领域中，保护端点，确保用户的隐私甚至安全至关重要。在这种情况下，低成本设备之间的安全群组通信是一个基本且具有挑战性的研究问题。也就是说，节点的计算资源有限，不确定的连接时间以及潜在的大量连接设备，使得将既定的解决方案应用于物联网设置是不切实际的。本文指定了一种名为Sharelock的安全协议，该协议提供了由通信节点组交换的消息的端到端安全性和机密性。该协议为通过不受信任的边缘服务器进行通信的节点建立了长期安全性，并通过使用不仅适用于低成本设备而且还适用于后量子密码的密码原语扩展到大型节点组。该协议旨在支持节点之间通用消息的交换和存储，从而使其适用于广泛的物联网应用。