Cryptography for Ultra-Low Power Devices

Motivation and Background

Ubiquitous computing describes the notion that computing devices will be everywhere: clothing, walls and floors of buildings, cars, the desert etc. Ubiquitous computing is becoming reality: RFIDs are currently being introduced into the supply chain. Wireless distributed sensor networks are already being used to monitor wildlife and to track military targets. Many more applications are being envisioned. For most of these applications some level of security is of utmost importance.

Providing security for ubiquitous computing provides special challenges. Common to all applications above is that the computing devices is that their power resources are severely limited. These are ultra-low power devices. The table below gives an overview of what ultra-low power means.

Application Power Source Power Range
Desktop Computer Power Grid 150 W - 500 W
Laptops High Capacity Battery 10 W - 120 W
Palm size devices, Cell Phones,
Embedded Systems
Battery 100 mW - 10 W
Wireless Sensors Tiny Batteries 1 mW - 100 mW
Smart Dust, RFID Energy Scavenging 1 μW - 500 μW

Power Spectrum

Current wireless sensor nodes are powered by tiny batteries. We are already seeing a trend to use energy scavengers to power sensor nodes. Scavengers convert ambient heat, noise, vibration, or light to electrical power. Sensor nodes that are powered solely by scavengers are called self-powered. The fact, that the sensor node communicates wirelessly and has no battery makes them autonomous. This opens up a whole new range of applications. The nodes can be placed in locations that are later entirely inaccessible.

Our Research

Many research groups are working on developing wireless sensor nodes, RFIDs, etc. The links section below lists a few of the major groups. A handful of research groups are trying to tackle the security challenges. However, the common perception in the wireless sensor node and in the RFID communities is, that public key cryptography is not possible on these tiny devices. We set out to challenge this assumption. Our goal is to develop a suite of cryptographic functions for authentication, encryption, and integrity that is specifically tailored to the needs ultra-low power devices. This includes public key cryptography and secure hash functions. For this we are examining existing cryptographic algorithms and either find energy efficient ways to implement them, improve them, or we develop new algorithms.

Publications

These are our publications about Cryptography for Ultra-Low Power Devices. For a complete list of the publications from the CRIS lab have a look at our publications page.

Links to Other Research Groups

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Last modified: Thursday, 22-Jan-2009 16:07:03 EST
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