Current Research Trends in IoT Security: A Systematic Mapping Study

Table 5

STM-based topic extraction results and top words per topic according to four criteria.

Topic (proportions)	Top words				Topic label
	Highest probability	Frequency and exclusivity	Lift weight	Score
1 (15%)	Security	Discuss	Attitude	Layer	IoT security issues
	Issue	Issue	Society	Security
	Challenge	Challenge	Taxonomy	WSN
2 (9%)	Data	Patient	Biometric	Patient	Secure data sharing for healthcare
	Access	Medical	Ciphertext-policy	Medical
	Encrypt	Healthcare	CP-ABE (Ciphertext-policy attribute-based encryption	Signature
3 (6.5%)	Algorithm	PUF (Physical unclonable function	Scalar	PUF	Lightweight encryption
	Encrypt	FPGA (field programmable gate array)	Simeck	S-box (substitution-box)
	Power	S-box	AES-GCM (advanced encryption standard-Galois counter mode)	FPGA
4 (7.6%)	Device	SDN	OpenFlow	Detect	Security with ML
	Attack	Learning	SDN-IoT	Attack
	Detect	Intrusion	Cyber-attack	SDN
5 (9%)	Model	Risk	ANP (analytic network process)	Workforce	Risk assessment
	Develop	Assess	Casual	Risk
	Risk	Measure	Diagram	Assess
6 (8.5%)	Authentication	Authentication	BAN	Authentication	Mutual authentication protocol
	Protocol	Mutual	PMIPv6 (Proxy mobile IPv6)	Protocol
	Attack	Protocol	AVISPA (automated validation of Internet security protocols)	Mutual
7 (7.4%)	Cloud	Edge	Colluding	Fog	MEC security
	Edge	Eavesdropping	SSR (secrecy sum rate)	Eavesdropping
	Fog	Fog	Tensor-based	Offload
8 (8%)	Node	Rout	Acyclic	Rout	Energy-efficient routing protocol
	Energy	RPL (routing protocol for low-power and lossy networks)	Leach	Energy
	Rout	Cluster	RPL	Cluster
9 (6.5%)	Sensor	Camera	Burglar	Arduino	Secure home automation system
	Control	Arduino	Caution	Camera
	Home	Raspberry	Diabetes	Gadget
10 (6%)	Smart	City	Commerce	Blockchain	Integration of blockchain and IoT
	Blockchain	Blockchain	Campus	Smart
	Home	Smart	Cart	City
11 (8.5%)	Privacy	Privacy	Cyber-physics	Privacy	Privacy preservation
	User	Preserving	Mile	Preserving
	Collect	User	Participant	Data
12 (8%)	Device	DTLS (datagram transport layer security)	EDHOC (ephemeral Diffie-Hellman over common open software environment)	DTLS	End-to-end security
	Protocol	CoAP	Rekey	TLS
	Key	End-end	AEAD (authenticated encryption with associated data)	CoAP