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SLEDE: Enhancing Sensor Network Security Protocols with Event-Based Specification

Sensor networks are crucial in hazardous environments, but securing them is challenging due to resource constraints. Introducing SLEDE, an event-based language for specifying and verifying security protocols, simplifying the process and offering greater expressive control over objectives. By enabling event-driven communication and addressing impedance issues, SLEDE enhances the formalization of network security protocols. This innovative approach leads to clearer, extensible, and more understandable specifications that aid in securing sensor networks effectively.

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SLEDE: Enhancing Sensor Network Security Protocols with Event-Based Specification

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  1. SLEDE: Event-Based Specification of Sensor Network Security Protocols* http://www.cs.iastate.edu/~slede Solution Problem • Sensor networks often used in hostile settings • New protocols emerging to secure these networks • Specifying and verifying these protocols is harder • Issues: group-oriented, resource constraint • SLEDE: An event-based specification language • Based on nesC syntax, a dominant programming language for networked systems • A model-based verification technique Event (Light, sound, motion, etc) node Sender { command result_t StdControl.init() { ... } event result_t Timer.fired() { ... call Transmission.broadcastMsg(msg); } } Action taken (Event Handler) Nodes in sensor networks use event-based paradigm Specification followsmessage-driven paradigm Implementation followsevent-based paradigm node Receiver { event result_t Receiving.receiveMsg(msg_t msg){ %if unable to decrypt, signal error signal Error.error(); % deliver message if decrypted call Transmission.deliver(msg); } } • Impedance mismatch leads to verification issues • e.g. missing assumptions • Results in proliferation of informal specifications Contributions • Easier to understand and write • Extensible w.r.t. intruder and channel models • More expressive objectives in terms of user-defined events • In existing specification languages, goals are fixed (e.g. SECRET, PRECEDES in CAPSL [1]) • Example objective: ensure that the data received from a certain node is not sent by an impersonator objective { Sender.Transmission.broadcastMsg(msg) => (Receiver.ReceiveMsg(msg) && Receiver.Transmision.deliver(msg)) || (Receiver.ReceiveMsg(msg) && Receiver.Error.error()) } lib securityLib{ command int hash(Key inputKey, msg_t theMsg) { ... } in SLEDE: Sender.Transmission.broadcastMsg(msg)=> Receiver.Receiving.ReceiveMsg(msg) && ! Receiver.Error.msgFromImpersonator() • Objectives described in terms of commands and events • Event-based communication is emulated using global channels in PROMELA model in CAPSL: can’t be represented [1] J. K. Millen. CAPSL:Common authentication protocol specification language .In NSPW’96Proceedings of the 1996 workshop on New security paradigms, 1996. *This research is supported in part by the National Science Foundation under grant CT-ISG 0627354 Youssef Hanna and Hridesh Rajan Department of Computer Science

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