# 6G Mobile Networks: Key Technologies, Directions, and Advances
## 6 Implementation of Security in 6G Network
### Security Challenges Associated with 6G Network
Well, with quantum gains for supervised and unsupervised learning for clustering and classification jobs, quantum machine learning algorithms may increase confidentiality and security in communications systems [83]. 1. Quantum replication attack: making a perfect clone of a piece of data in a randomised quantum state without changing the data's initial condition. 2. Quantum collisions attack: Whenever 2 distinct inputs to a hashing algorithm deliver alike outputs in a quantum context, this is known as a quantum collision attack. * Based on Terahertz: THz communications have been anticipated to play a crucial role in 6G technology. With enhanced security at the physical layer, the THz frequencies have improved signal directivity that prevents unauthorised parties from being in the same direct relationship as the authorised user to capture signals. Nevertheless, by positioning an item in the route of transmission to deflect radiation toward himself, an eavesdropper could also capture a signal in line-of-sight (LoS) broadcasts [84]. 1. Access control attacks For gaining entry to restricted resources or changing system settings, parties violate access rules, steal information, or kidnap users. 2. Eavesdropping attack: Despite being resistant to intercepting assaults, broadcasts with strong polarity in small ranges are nevertheless vulnerable to hostile nodes capturing the signals. * Based on Visible Light Communication: Owing to the benefits of radio frequency (RF) systems, like fast data speeds, a broad accessible spectrum, resilience over interference, & intrinsic security, VLC is indeed an optical wireless technology that has gained significant attention. Contrary to RF systems, VLC mechanisms can provide a better protection level since light cannot pass through solid objects like walls. The broadcasting format & LoS propagation of VLC systems, make them open to eavesdropping by unauthorised nodes present within the transmitters' broadcasting area. For such
construction of useful VLC systems, the confidentiality of the systems is an essential concern [85]. 1. Data-tampering or jamming attacks: Unauthorized transmissions can go unnoticed in VLC or hybrid VLC-RF systems. The likelihood of an effective assault is increased via a finely focused transmitter, such as those created by optical beamforming methods [86]. 2. Eavesdropping attack: Whenever node terminals are placed in public spaces, wide screens are present in the covering zones, & there are cooperative eavesdroppers, they become just as susceptible as RF. * Metasurface-in-the-Middle Attack: Experts claim that 6G would potentially be greatly secured over wireless technology having greater beamwidths since it uses highly directional antennas. The idea is that by tightly focusing communication between the receiver and transmitter, the possibility of an eavesdropper intercepting a channel is reduced. Scientists at Rice University reported a man-in-the-middle attack targeted at 6G frequencies to highlight genuine security issues in an effort to verify that 6G is secured while technologies are being explored [87]. A well constructed metasurface may be used by an attacker to capture communication at 6G frequency, according to the experts, who refer to their assault as a metasurface-in-the-middle attack (MSITM). Through creating a metasurface & positioning it exactly in the path of vision between transmitter and receiver, the attacker can divert some part of sensitive communication. The resultant programmable scattering radiation patterns may create a diffraction-based eavesdropping route for the enemy. This could cause a phasing mismatch at the surface interface [88]. * Parameter attack: Injection assaults against cross-domain data services might result from improperly vetted parameters. Logic corruption, data manipulation, & data injection all happen. Data on the topology of the network is changed to introduce hostile nodes and fictitious linkages. Fake parameter injection that is ongoing might result in a denial-of-service assault that leaves data services unusable [89].