# Review of Physical Layer Security in 5G Wireless Networks
## 3 Literature Review
[21] provided an overview of the problems with wireless security and the defence mechanisms designed to defend the availability, authenticity, secrecy, and integrity of wireless transmissions from malicious attacks. In order to fulfill the exponentially growing demand, wireless transportation substructures and facilities have been expanding over the past few decades. The announcement nodules in wired linkages are materially associated with cables. Wireless linkages, in comparison, are very susceptible as the wireless equipment is the transmission. In this article, we examine the variety of wireless outbreaks and refuge risks that might come across several etiquette coatings, ranging from the application level to the physical layer. The threats are characterized by application layer and transport layer attacks, network layer, MAC layer, and physical layer attacks. Then, in the circumstance of numerous extensively used remote linkages, such as Bluetooth, LTE, and Wi-fi, present refuge standards and procedures designed on behalf of defending in contradiction of attacks on the various protocol coatings have been swotted. More specifically, a number of physical layer security methods have been given and contrasted, containing information-theoretic refuge, simulated noise-aided refuge, diversity-assisted refuge, and physical-layer undisclosed key cohort processes. We have also provided an overview of the major wireless jamming assault types, as well as methods for detecting and avoiding them. [PERSON] et al. [22] explained a thorough analysis of physical layer refuge in multiuser remote linkages. In order to guarantee trustworthy or sheltered transportation in the existence of oppositional consumers, the two essential properties of the remote medium--broadcast and superposition--present several obstacles. They began by providing a general overview of the information-theoretic security foundations going back to [PERSON], [PERSON], and [PERSON]'s ground-breaking work. They then discussed how locked communication policies evolved from point-to-point networks to several antenna structures before generalizing to greater multiuser linkages. Only a few of the potential directions for future research in this area are discussed here. For instance, there has not been much research into how physical layer security approaches might be applied to commercially available wireless systems. The majority of the methods included in this review are independent of the fundamental air edge, such as generated sound for observer jamming and CSI-based precoding to maximize privacy rates. After distributing the data with a pseudo-noise sequence, a CDMA transmitter might carry out the same action. Another rich but untapped area for research is a greater comprehension of the interactions between traditional cryptography security and physical layer security. Secure transmission techniques that keep the secret message concealed so that possible listeners are unsure whether transmissions are in progress are also of interest at the moment. [PERSON] and [PERSON]'s [23] study examines how quantum computing can affect actual security, concentrating on how it might affect 5G networks. The authors analyze the risks posed by quantum computers and examine vulnerabilities in the current cryptographic systems used in 5G networks. They offer insights into the challenges and opportunities involved with incorporating quantum-safe protocols into current infrastructure and propose a novel quantum-safe security mechanism created for 5G systems. The main conclusions highlight the serious threat that quantum computers pose to the security of cryptographic systems in 5G networks, the vulnerability of the current security mechanisms to quantum computer attacks, and the requirement for quantum-safe cryptographic algorithms and protocols to guarantee the long-term security of 5G networks. The paper also underlines the importance of giving different technical and practical difficulties due thought when incorporating quantum-safe protocols into the current 5G infrastructure.