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Scalable RFID Systems: A Privacy-Preserving Protocol with Constant-Time Identification

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4 Author(s)
Alomair, B. ; Comput. Res. Inst. (CRI), King Abdulaziz City for Sci. & Technol. (KACST), Riyadh, Saudi Arabia ; Clark, A. ; Cuellar, J. ; Poovendran, R.

In RFID literature, most “privacy-preserving” protocols require the reader to search all tags in the system in order to identify a single tag. In another class of protocols, the search complexity is reduced to be logarithmic in the number of tags, but it comes with two major drawbacks: it requires a large communication overhead over the fragile wireless channel, and the compromise of a tag in the system reveals secret information about other, uncompromised, tags in the same system. In this work, we take a different approach to address time complexity of private identification in large-scale RFID systems. We utilize the special architecture of RFID systems to propose a symmetric-key privacy-preserving authentication protocol for RFID systems with constant-time identification. Instead of increasing communication overhead, the existence of a large storage device in RFID systems, the database, is utilized for improving the time efficiency of tag identification.

Published in:

Parallel and Distributed Systems, IEEE Transactions on  (Volume:23 ,  Issue: 8 )