Rfid2010 Presentation Final1

Gaurov Narayanaswamy, Shesh Kumar Jagannatha and Daniel W. Engels

Blocking Reader 15 April 2010Slide 1

Handheld Readers

Alien Readers Alien Readers

Sirit Readers

Tagged Objects

Blocking Envelope

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Introduction• Passive UHF RFID.• Readers ,Tags and Back-end Information system• Tags have unique identifier.• Wirelessly communicates identifier• Frequency of operation 860-960 MHz.

Reader

Back-end Information System

Reader Antenna

Tags (Recall Excalibur, UPM, Alien Squiggle)

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Threats to Privacy and Security

[1] Ari Juels. Rfid security and privacy: A research survey. IEEE Journal on Selected Areas in Communication,, 24.

• RFID doesn’t require LOS.

• Privately owned Tags can

be read by any Readers.

• Snooping aids thieves and spies.

• RFID Technology advancing too fast.

• Security threat to Industry.

• Security threat when used in military. Picture [1]

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Previous Work:

• Blocker Tag [2]

• Killer Tag approach

• Faraday Cage approach

• Active Jamming approach

• Smart RFID Tag approach

- Hash-lock approach (Meta-ID)

- Re-encryption approach ( Bank notes)

- Silent Tree-Walking [3]

[2] Ari Juels , Ronald L. Rivest , Michael Szydlo, The blocker tag: selective blocking of RFID tags for consumer privacy, Proceedings of the 10th ACM conference on Computer and communications security, October 27-30, 2003, Washington D.C., USA[3] S. A. Weis, S. Sarma, R. Rivest, and D. Engels. Security and privacy aspects of low-cost radio frequency identification systems. In First International Conference on Security in Pervasive Computing, 2003.

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Motivation

• Personal Privacy can be preserved by a simple device.

• Scope for Low-Cost UHF RFID Reader.

• Implementation of this on a persons body.

• Tag Capture.

• Multiple Tags.

• Communication Interface approach.

• Protocol approach.

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ISO 180006-C Gen 2 Protocol.

Figure: Single Tag Reply [3]

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Theory of Tag capture:

• Power:

Tags responds to higher

power

• Frequency Hopping:

Tuned Frequency

• Slot Duration:

Time between two slots

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Theory of Tag capture for a typical Passive Tag:

• Tags choose higher power

• Filter takes time to switch

to different frequency.

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Implementation of Blocking Reader:

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Complete circuit diagram

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Performance of Blocking Reader:

Sniffer Blocking Reader

Squiggle Tag

Distance D

Height1.4 m

Tag Reply:

• Reply seen for a alien squiggle Tag.• Used NI Sniffer.

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Performance of Blocking Reader cont..:

Vapc = 1.6 (Power= 9dBm)

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Performance of Blocking Reader cont..:Sirit Reader

Blocking Reader

Squiggle Tag

1.5 mts Distance D

Height1.4 mts

Maximum Blocking distance when an unauthorized Sirit Reader is present

Vapc = 2.6 (Power= 21dBm)Vapc = 1.6 (Power= 9dBm)

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Performance of Blocking Reader cont..:Blocking Range results comparing with Friis Power

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Performance of Blocking Reader cont..:

Sirit Reader

Blocking Reader

Squiggle Tag

2.1 mts

Distance D

Height1.4 mts

θ

Blocking Envelope: Around the Tag

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Blocking Reader application:

Sirit Reader

Squiggle Tag

Height1.4 mts

θHuman Body

Distance D2.7

mts

Blocking Reader

Performance of BR in presence of Human

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Conclusions:

Blocking Reader creates blocking envelope around the Tag preserving it from being read from any unauthorized Reader.

Blocking Reader is designed to be FCC compliant.

Blocking Reader also creates an envelope around a person wearing it, preserving privacy of his Tags.

Blocking Reader works by capturing the Tags.

Blocking Reader is a Low-Cost Device.

Any Reader can be used as Blocking Reader.

Maximum Blocking envelope is 1.4 mts

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Thank You

Any Questions ??