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A standardized requirement for all IoT systems is that, all the IoT devices are essentially required to know the identity of other devices of the system to interact with. For effective access management of the devices must be owned by a known owner. Here the known owner signifies a user or an entity which is uniquely distinguishable and whose identity can be established uniquely. Deployment of IoT system was initially based up on the IP address range allocated as well as the physical location of IoT devices in the specified geographical area of the system. Identity management of IoT was initially addressed by assigning object naming and IP addressing schemes. Since there are increasing efforts by research community for secured identification, authentication, as well as access management issues with IoT system, several new methods and means have emerged. A few such methods used for identity establishment and resource authorization are Ubiquitous code, ODI, short OID, EPC and RFID identifiers.

Subsequently cloud computing method was adopted to assign virtual identity to users and things. The main drawback of such method was to only handle the addressing virtual identity issues, without considering various underneath protocols for data transmission and their applications on the IoT environment. Similarly Wireless Sensor Network (WSN) protocol having identity management functionality as well as clustering of things has not been able to address the specific requirements of mobility of objects and their data transfer in the environment. Some other means were considered in IoT environment only for user identifications such as Open ID, Liberty Alliance and Shibboleth. Provisioning of identity management cycle using Cloud computing was initially based upon centralized solution model for authentication and authorization of resources. This was also used for proper resource accessibility and availability for desired application and service. However over a period of time it was realized that having a single point of failure in a centralized as well as critical system needs due attention. Alternatively desired mechanism needs to be adopted for tackle this issue.

Various ways and means to address this concern of IAM are going to be one of the prime focuses for the chapter. The following section analyzes how cloud enabled IoT solutions have attempted to handle IAM related matters in IoT ecosystem.