Novel Internet services are emerging around an increasing number of sensors 
and actuators in our surroundings, commonly referred to as smart devices. 
Smart devices, which form the backbone of the Internet of Things (IoT), enable 
alternative forms of user experience by means of automation, convenience, and 
efficiency. At the same time new security and safety issues arise, given the 
Internet-connectivity and the interaction possibility of smart devices with 
human's proximate living space. Hence, security is a fundamental requirement 
of the IoT design. In order to remain interoperable with the existing 
infrastructure, we postulate a security framework compatible to standard 
IP-based security solutions, yet optimized to meet the constraints of the IoT 
ecosystem. In this ongoing work, we first identify necessary components of an 
interoperable secure End-to-End communication while incorporating Public-key 
Cryptography (PKC). To this end, we tackle involved computational and 
communication overheads. The required components on the hardware side are the 
affordable hardware acceleration engines for cryptographic operations and on 
the software side header compression and long-lasting secure sessions. In 
future work, we focus on integration of these components into a framework and 
the evaluation of an early prototype of this framework.