The term Internet of Things refers to the interconnection of networks of smart objects and technologies on the global Internet, as well as a set of technologies that make up these objects and their applications and services. The Internet of Things has great limitations on their resources and there are many challenges to enable security of the transmitted information. Every security implementation should take these limitations into account, which motivated this research. This research aims to propose different security architectures, using standardized protocols for the Internet of Things, analyzing the energy consumption of the network when using the security protocol DTLS. We use the Contiki simulation environment to test the DTLS protocol in a client/server scenario to verify the energy consumption of the handshake process.