Poster abstract: Suppressing CSI leakage in multi-user MIMO networks via precoding

Seoungbin Bae; Youngki Kim; Heejun Roh; Wonjun Lee

doi:10.1109/INFOCOMWKSHPS50562.2020.9162658

Poster abstract: Suppressing CSI leakage in multi-user MIMO networks via precoding

Seoungbin Bae, Youngki Kim, Heejun Roh, Wonjun Lee

School of Cybersecurity

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

In multi-user MIMO (MU-MIMO) systems using zero-forcing beamforming (ZFBF), an Access Point (AP) utilizes downlink channel state information (CSI) to transmit data streams to multiple clients simultaneously. Since private information of clients can be extracted from CSI, leaking CSI to attackers is considered as harmful so that some research efforts suggest to encrypt CSI feedback. However, a recent study shows that an attacker can infer CSI by eavesdropping data streams with known symbols, not the feedback. To this end, we propose CSIstray that intentionally increases the proportion of inter-client interference to suppress CSI leakage while maintaining bit error rates (BERs) at the clients. Simulation results with a 2×2 MU-MIMO scenario show that CSIstray effectively degrades the attack performance with little impact on downlink transmission. We further implement CSIstray on our testbed to validate the proposed mechanism works properly in a room-scale environment as well as in simulation results.

Original language	English
Title of host publication	IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	1364-1365
Number of pages	2
ISBN (Electronic)	9781728186955
DOIs	https://doi.org/10.1109/INFOCOMWKSHPS50562.2020.9162658
Publication status	Published - 2020 Jul
Event	2020 IEEE INFOCOM Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020 - Toronto, Canada Duration: 2020 Jul 6 → 2020 Jul 9

Publication series

Name	IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020

Conference

Conference	2020 IEEE INFOCOM Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020
Country/Territory	Canada
City	Toronto
Period	20/7/6 → 20/7/9

Bibliographical note

Funding Information:
ACKNOWLEDGEMENT This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (No. 2019R1A2C2088812). Wonjun Lee is the corresponding author.

Publisher Copyright:
© 2020 IEEE.

Keywords

Channel state information leakage
Interference
Multi-user MIMO
Zero-forcing beamforming

ASJC Scopus subject areas

Computer Networks and Communications
Computer Science Applications
Hardware and Architecture
Information Systems and Management
Safety, Risk, Reliability and Quality

Access to Document

10.1109/INFOCOMWKSHPS50562.2020.9162658

Cite this

Bae, S., Kim, Y., Roh, H., & Lee, W. (2020). Poster abstract: Suppressing CSI leakage in multi-user MIMO networks via precoding. In IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020 (pp. 1364-1365). Article 9162658 (IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/INFOCOMWKSHPS50562.2020.9162658

Poster abstract: Suppressing CSI leakage in multi-user MIMO networks via precoding. / Bae, Seoungbin; Kim, Youngki; Roh, Heejun et al.
IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020. Institute of Electrical and Electronics Engineers Inc., 2020. p. 1364-1365 9162658 (IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Bae, S, Kim, Y, Roh, H & Lee, W 2020, Poster abstract: Suppressing CSI leakage in multi-user MIMO networks via precoding. in IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020., 9162658, IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020, Institute of Electrical and Electronics Engineers Inc., pp. 1364-1365, 2020 IEEE INFOCOM Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020, Toronto, Canada, 20/7/6. https://doi.org/10.1109/INFOCOMWKSHPS50562.2020.9162658

Bae S, Kim Y, Roh H, Lee W. Poster abstract: Suppressing CSI leakage in multi-user MIMO networks via precoding. In IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020. Institute of Electrical and Electronics Engineers Inc. 2020. p. 1364-1365. 9162658. (IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020). doi: 10.1109/INFOCOMWKSHPS50562.2020.9162658

Bae, Seoungbin ; Kim, Youngki ; Roh, Heejun et al. / Poster abstract : Suppressing CSI leakage in multi-user MIMO networks via precoding. IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020. Institute of Electrical and Electronics Engineers Inc., 2020. pp. 1364-1365 (IEEE INFOCOM 2020 - IEEE Conference on Computer Communications Workshops, INFOCOM WKSHPS 2020).

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abstract = "In multi-user MIMO (MU-MIMO) systems using zero-forcing beamforming (ZFBF), an Access Point (AP) utilizes downlink channel state information (CSI) to transmit data streams to multiple clients simultaneously. Since private information of clients can be extracted from CSI, leaking CSI to attackers is considered as harmful so that some research efforts suggest to encrypt CSI feedback. However, a recent study shows that an attacker can infer CSI by eavesdropping data streams with known symbols, not the feedback. To this end, we propose CSIstray that intentionally increases the proportion of inter-client interference to suppress CSI leakage while maintaining bit error rates (BERs) at the clients. Simulation results with a 2×2 MU-MIMO scenario show that CSIstray effectively degrades the attack performance with little impact on downlink transmission. We further implement CSIstray on our testbed to validate the proposed mechanism works properly in a room-scale environment as well as in simulation results.",

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Poster abstract: Suppressing CSI leakage in multi-user MIMO networks via precoding

Abstract

Publication series

Conference

Bibliographical note

Keywords

ASJC Scopus subject areas

Access to Document

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