Table 3. Comparison of safety analysis.

Security	Our study	Lee et al.	Ceipidor et al.	Thammarat et al.	Tung et al.
Confidentiality	Yes	No	No	No	No
Preventing man-in-the-middle attacks	Yes	-	-	Yes	Yes
Prevent replay attacks	Yes	No	No	Yes	Yes
Prevent brute force attacks	Yes	-	-	Yes	Yes
Integrity	Yes	No	-	Yes	Yes
Mutual authentication	Yes	-	Yes	Yes	Yes

Note that the "-" in the table indicates that this study claims that the solution can provide this security attribute, but other studies believe that the solution still lacks this security attribute.