Secure information sharing with mirroring null steering through untrusted relay with two antennas

Tetsuya Noguchi, Osamu Takyu, Takeo Fujii, Tomoaki Ohtsuki, Fumihito Sasamori, Shiro Handa

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Citations (Scopus)


This paper proposes the novel secure information sharing among wireless nodes by the physical layer security based on multi-antenna null steering. For secure wireless communication, the secure information like the common key of cypher should be shared among nodes before data transmission. However, in wireless adhoc network, the untrusted relay node may steal the data under relay process. In the proposed sharing, a source node and two sink nodes send the information conveying signal and the artificial noises to relay station, simultaneously for avoiding decoding the information in the untrusted relay. After amplifying and forwarding relay, the two nodes do not decode the information from the received signal without removing artificial noises. The untrusted relay constructs the null steering with two antennas for removing the artificial noise. Since the channel transfer functions through which the two artificial noises are passed are common, the null points to two sink nodes can be constructed. As a result, the two nodes can remove the artificial noises. This null steering is mirroring null steering. The computer simulation shows the effect of proposed information sharing in terms of secure capacity.

Original languageEnglish
Title of host publicationRWS 2018 - Proceedings
Subtitle of host publication2018 IEEE Radio and Wireless Symposium
PublisherIEEE Computer Society
Number of pages3
ISBN (Electronic)9781538607091
Publication statusPublished - 2018 Feb 28
Event2018 IEEE Radio and Wireless Symposium, RWS 2018 - Anaheim, United States
Duration: 2018 Jan 142018 Jan 17

Publication series

NameIEEE Radio and Wireless Symposium, RWS
ISSN (Print)2164-2958
ISSN (Electronic)2164-2974


Other2018 IEEE Radio and Wireless Symposium, RWS 2018
Country/TerritoryUnited States


  • Multi-antenna Null Steering
  • Physical Layer Security
  • Untrusted Relay

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Communication


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