Due to the rapid development of the Internet of Things (IoT), the issue of data security has become increasingly prominent. According to relevant data, nearly 70% of the existing connected devices are vulnerable to network attacks, resulting in data loss or theft. This figure undoubtedly makes us feel terrible, and also makes us raise the security of IoT data. On the agenda. Internet of Things hides high risk The stalwart blueprint of the Internet of Things is to make everything on the earth smarter and communicate with each other. Imagine, when the car fails, it automatically prompts you which component has a problem; when the building automatically reminds you which part needs reinforcement and repair, what kind of spectacular scene will the world be? Behind the beautiful scene, there is a security crisis. The Stuxnet attack that took place in 2011 eventually led to damage to the centrifuge and disrupted the core processing capacity of the entire facility. The control system that was attacked caused the centrifuge to deviate slightly from the allowable parameters, but the report showed that everything was normal until no damage was reported before the centrifuge was damaged. In view of this, the Internet of Things has an urgent need for security. Analysis of WSN Security Technology in Internet of Things Perception Layer As one of the indispensable systems of the Internet of Things, strengthening the security of WSN is also an indispensable task. Here are some WSN security technology applications for everyone. (1) Key management Key management is the core of information security technology and the core of WSN security technology. There are four main types of key management: simple key distribution protocol, dynamic key management protocol, key pre-distribution protocol, and layered key management protocol. In a simple key distribution protocol, all nodes use the same key, which is encrypted by the sender and decrypted by the receiver. This key distribution protocol occupies very little memory and it is obvious that its security is also the worst. Thus, in WSN technology, this protocol is rarely used. In the dynamic key management protocol, the key of the node is periodically replaced according to the needs of the user, and a dynamic key management mode is formed. This key distribution protocol can effectively guarantee the security of the network. In a key pre-distribution protocol, a network node is assigned a set of keys before deployment. After the node is deployed, the sensor node establishes a node shared key and redistributes the key. This key distribution protocol can also effectively ensure the security of the network. In the layered key management protocol, the LEAP protocol is adopted, which is a typical deterministic key management protocol, which uses a variety of key mechanisms to jointly maintain network security. In each node, four keys are allocated, which are the identity key shared by the pre-distributed base station, the key group shared by the pre-distributed intra-network nodes, the neighbor key shared by the neighboring nodes, and the cluster head shared. Cluster head key. This key distribution protocol is the most efficient and secure of the protection. WSN key management methods can be divided into symmetric key encryption and asymmetric key encryption. The feature of symmetric key encryption is that both sides of the communication use the same key, and the sender uses this key for encryption, and the receiver also uses this key for decryption. The key length of this key encryption technology is not long, and the calculation, communication and storage overhead are relatively small, which is more suitable for WSN, and thus is the mainstream way of WSN key management. Non-symmetric key encryption means that nodes use different encryption and decryption keys. Due to their high computational, storage, communication and other capabilities, they have long been considered unsuitable for WSN. However, recent studies have shown that asymmetric key encryption can be applied to WSN after optimization. From the perspective of information security, the security of the asymmetric key system must be much higher than that of the symmetric key system. To solve the physical damage problem of the WSN node, the tamper-resistant device can be used in the node to add a layer of protection for the node protection. A physical damage sensing mechanism can be added to provide early warning of physical damage. In addition, some sensitive information can be encrypted and stored by a lightweight symmetric encryption algorithm to protect information security. For example, ST's STM32W MCU family is based on IEEE 802.15.4 SoC, ARM Cortex-M3 24MHz processor, built-in 64~128KB flash memory, 8K SRAM. Support ZigBee and 6LoWPAN protocol, and AES -128 hardware encryption to ensure data transmission security.
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