IoT is considered one of the most successful technologies. Continuous development connects millions of smart devices every day, which is strongly demonstrated in the transfer, reception and processing of data. To ensure the success of IoT, Quality of Service (QoS) assurance is used to mitigate the limitations of equipment and network infrastructure. QoS improves end-to-end latency, network throughput, network and packet delivery rates. The growth of IoT devices drives security requirements. In this article, we clarify how to use QoS-optimal to increase the security of IoT devices.
We are not talking about IoT in depth. Readers can find more articles on this topic on Speranza’s blog. In short, IoT is a system for connecting and monitoring devices through the Internet. To operate the IoT system well, the time factor must be carefully considered. The response time of IoT applications must be fast and constant to satisfy users. Therefore, people use lossless transmission methods and architectures such as fog computing, edge computing (including virtual network nodes to reduce network latency). However, this very approach poses some challenges for IoT security. Internet security practices cannot be directly applied to the IoT. Therefore, it is necessary to use advanced techniques such as QoS for more security for IoT. Research by scientists from Kalinga University, India  shows the essential security elements of IoT devices:
Fig1: Security requirements that IoT devices must have. Made with Canva. Content from: https://www.ijeat.org/wp-content/uploads/papers/v9i2/B3757129219.pdf
2.1. Presentation of the quality of service
Quality of Service (QoS) is a mechanism that controls traffic and regulates overall network traffic by prioritizing applications that require network priority. By using QoS, applications can be greatly improved on the network, especially in terms of speed, latency, packet loss and transmission. QoS can be used for IoT applications, applications for watching movies, online meetings, video calls, etc. 
Fig2: Bandwidth without QoS compared to bandwidth with QoS. Source: https://blogs.salleurl.edu/en/qos-datacenters
2.2. How does the quality of service work?
Have you ever taken the bus rapid transit line (BRT)? In the event of a traffic jam, the BRT can still move thanks to its own lane. QoS networking technology works similarly by creating separate virtual queues for applications based on a predefined priority. With QoS, the network administrator has the power to specify the order in which packets are processed by determining the priority of the application. 
Through the above operations, QoS can improve network traffic types. Types of network traffic you should be aware of:
- Bandwidth : The speed of the link. QoS can handle different bandwidths for different priority applications.
- Latency: The time it takes for a packet to travel from source to final destination. QoS improves latency by creating virtual queues.
- Loss: Data is lost during packet transfer. QoS allows the administrator to decide which packets to drop when needed
- Jitter: When the network is congested, packets are transported at unequal rates, causing them to arrive at their destination out of order. IoT applications cannot work if this situation occurs frequently. QoS can limit this.
2.3. Benefits of QoS in IoT Security
- Improve bandwidth, latency; reduce loss, jitter: The operation of QoS improves the transmission of the network, which facilitates security.
- Send alerts quickly and efficiently: thanks to QoS, IoT applications can send alerts quickly and accurately. Priority selection also broadcasts critical alerts at any time
- Reduce equipment by optimizing the network: when the transmission line is optimized, the network nodes can be reduced while meeting the usage and security needs.
- Cost savings: not so much related to security, but by reducing the devices, the costs will also be reduced, but the quality of security is improved.
3.1. Ideas on QoS Optimization
QoS is good, it’s very true for IoT. But QoS was not created for security purposes, but to improve network traffic. Therefore, it is necessary to combine QoS with other technologies to improve overall security. The IoT architecture consists of 3 main components: application layer, network layer, perception layer.
Fig4: 3 components of the IoT architecture. Source: https://www.netburner.com/learn/architectural-frameworks-in-the-iot-civilization/
Many studies suggest that QoS solutions are used to improve security performance at all three layers, but for the best effect, researchers often use QoS optimization to improve security at the network layer. There are many ways to optimize service quality, depending on the objective. We present to you a study of science from the University of Kalinga, India. They use a typical fog computing IoT architecture due to its enhanced security capabilities. The weakness of fog computing is that trunks at virtual nodes can be attacked, the use of QoS and techniques such as machine learning, Cognitive Radio Networks (CRNs) improve this well.
Fig5: Step to apply QoS optimization in IoT Security. Source: https://www.ijeat.org/wp-content/uploads/papers/v9i2/B3757129219.pdf
3.2. QoS Optimization Security Application in Practice
Also according to the study, the fields in which the security techniques of optimizing the quality of service can be applied can be banking, the army and health.
- Banking: Data in financial industries like banking is extremely important and protected. It is also valuable data that hackers can attack, especially when IoT data grows and reveals weaknesses. Offering solutions such as optimizing the quality of service can help banks secure customer information.
- Military: More and more devices in the military are IoT devices. The use of IoT in the military field is inevitable due to its synchronization, speed and high efficiency. The IoT can influence intelligence operations. When this IoT data is related to national security, it is necessary to keep it as secure as possible.
- Health care: telemedicine services need the service of IoT devices. The IoT is appearing more and more in the medical field, which means that it stores more and more personal information about patients. It is therefore necessary to secure health IoT devices.
Security in the IoT is essential, from protecting patient information to protecting national security. In business operations, good security gives you deep trust from your customers and a solid foundation for bold business ideas. If you hesitate with IoT for security reasons, this article is a suggestion for you on how to do good business with IoT without worrying about security. If you have any concerns, we are always at your side, ready to help.
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*** This is a syndicated blog from the IoT Blog Security Bloggers Network – Speranza written by Allen. Read the original post at: https://www.speranzainc.com/security-with-qos-optimization-in-iot/