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This work describes a practical solution for the problem of cryptographic key establishment and secure communication in the context of the Internet of Things, in which computational eciency is a fundamental requirement. A symmetric-key establishment protocol based on AES, Poly1305-AES, time synchronization, Elliptic Curve Die-Hellman and sensor IDs is proposed to achieve data condentiality, authentication, integrity and prevention from replay attacks. Such a protocol was implemented in the EPOSdoi:10.5220/0005262701970206 dblp:conf/sensornets/ResnerF15 fatcat:excu6ulgjzfehlndtaor6up2ce