authentication and access control in IoT I am researching in authentication and access control in IoT. Is there any difference between working in wireless sensor nodes and IoT in the topic authentication and access control as both require lightweight designs?
Not much, my impression is that the problems are more or less the same. People change the term to IoT because it sounds sexier than wireless sensors (and they can sell the same thing again as new). Another similar term is pervasive (ubiquitous) computing. Yet another related term is edge computing or fog computing. 

The main underlying research challenges for security in all those are often the following:


resource-limited devices
lack of trust
decentralized
weak physical security
hard to update
often has energy constraints


just to name a few.