โ Scribed by Wood, Anthony D.; Stankovic, John A.
No coin nor oath required. For personal study only.
Many wireless sensor networks (WSNs) for medical, military, and control applications require strong security protection of messages. Yet, the algorithms and protocols used must be efficient in space and time due to the constrained resources of sensor devices.Existing link-layer security solutions for WSNs, such as SPINS [3] and TinySec [2]), rely on software-level encryption and authentication routines. Due to memory and computation limitations, these have used algorithms that are considered less secure than the Advanced Encryption Standard (AES). Also, they do not provide explicit support for concurrent use of multiple keys and security modes.We briefly present AMSecure, a new link-layer security component we developed for MICAz and Telos motes, which both use the Chipcon CC2420 radio transceiver. AM-Secure uses its built-in support for inline AES cryptographic operations specified in the IEEE 802.15.4 standard . Message confidentiality, authentication, integrity, replay protection, and semantic security are provided.AMSecure uses hardware-accelerated cryptography in a backward-compatible manner with insecure Active Messages (the messaging layer in TinyOS). It supports multiple keys per source, allowing operation with the many key management schemes in the literature. It also allows TinyOS components to specify, on a per-message basis, the security mode to use: none, authentication-only, encryption-only, or authentication and encryption. AMSecure is therefore efficient, composable, and more flexible than previous solutions.We fully implemented AMSecure on MicaZ motes, and evaluated it by collecting real performance measurements.
AMSecure Description
AES security modes supported by AMSecure are those specified in IEEE 802.15.4 [1] and which have hardware Copyright is held by the author/owner(s).
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