The fast evolution in microelectronics and the emergence of wireless communication technologies, have allowed the appearance of the promising field of Internet of Things (IoT). The latter is more and more present in the human life, that is why it becomes essential to secure the communications done with the connected objects. Almost all communicating systems attach great importance to security, consequently, on the cryptographic key management. The existing key management schemes for conventional networks are relatively resource-intensive, that is why they are not adequate for resource-constrained networks like IoT, especially since the nodes’ capabilities are heterogeneous. In this paper, we focus on exchanging and updating of cryptographic keys among the IoT objects often limited in resources, where we propose a new form of key exchange based on the mechanism of concealing encryption keys, while exploiting the misused spaces in the header fields of the exchanged packets by the communication standards, such as ZigBee, BLE, WiFi.

微电子学的快速发展和无线通信技术的出现，使物联网（IoT）的前景广阔。后者在人类生活中越来越多，这就是为什么确保与连接对象进行的通信变得至关重要的原因。因此，几乎所有通信系统都非常重视安全性，即密码密钥管理。常规网络的现有密钥管理方案是相对耗费资源的，这就是为什么它们不适用于像IoT这样的资源受限网络的原因，特别是因为节点的功能是异构的。在本文中，我们专注于经常在资源有限的IoT对象之间交换和更新密钥，