Location Privacy Workshop (LPW) 2021

@ ARES 2021 - TU Wien, Vienna, Austria (virtual) - August 19, 2021


27/07/2021 ‒ Accepted papers and the program are now available, including a keynote by Prof. Stephen B. Wicker, Cornell University. Please register here. Looking forward to seeing you (virtually) at LPW 2021!
30/04/2021 ‒ The paper submission deadline has been extended to May 17.
25/03/2021 ‒ The workshop (as well as ARES 2021) will be held as a virtual event.
24/02/2021 ‒ The Call for Papers for LPW 2021 has been announced.

LPW 2021 ‒ The Third Location Privacy Workshop

Location and mobility data are highly sensitive, as they can be used to infer a number of other personal and sensitive data on an individual. However, human mobility is highly predictable, and location information is routinely collected by location-aware devices (e.g. smartphones), connected vehicles and smart transportation systems, e-tolling, and cameras with face recognition among others.

Location privacy is a rapidly developing research area, and the third Location Privacy Workshop (LPW 2021) provides a platform for original research and discussion on all technical aspects of privacy and security of location-based services.


Accepted papers will appear in the main conference proceedings (ARES 2021), published by ACM on the International Conference Proceedings Series (ACM ICPS). They will be available on the ACM digital library indexed by Scopus, dblp, etc.


Topics of interest

  • Security of location-aware mobile devices
  • Privacy-enhancing technologies for location-based services
  • Privacy and anonymity in (public) transportation systems
  • Privacy in connected autonomous vehicles
  • Security of smart mobility applications
  • Privacy in location-aware social media
  • Privacy in position-based advertising
  • Malicious and pervasive tracking, de-anonymization
  • Cryptographic protocols and schemes for location information
  • Data structures for location information
  • Security and reliability of positioning systems
  • Location verification and authentication
  • Location forensics
  • Data protection techniques for regulatory (GDPR) compliance
  • Privacy in location-based contact tracing
  • …and any other related topic

LPW 2021 is co-located with the 16th International Conference on Availability, Reliability and Security (ARES 2021). The conference is currently scheduled as an in-person event in Vienna, Austria. After studying and evaluating the current COVID-19 situation, the Chairs of ARES 2021 decided to convert the conference (and consequently LPW) into an all-digital conference experience.

Call for Papers

The Call for Papers is available for download:

Please help us spread the word!


Perspective authors are invited to submit novel contributions, application papers and case studies. Submission should be 6-8 pages in the double-column ACM conference format (template below). Short papers and position papers (3-4 pages) are also welcome. Submissions must be anonymous with no author names, affiliations, acknowledgments, or obvious references. Submitted papers will be carefully evaluated based on originality, significance, technical soundness, presentation and clarity of exposition.

All accepted papers will be published on the ACM digital library alongside the main conference proceedings, and indexed in Scopus, dblp, etc.

At least one author of each accepted paper is required to register for the ARES 2021 conference, and present the paper. We reserve the right to exclude a paper from distribution after the conference, including withdrawal from the ACM proceedings, if the paper is not presented by an author (either virtually or in presence, see below) at the conference.

Both LPW and ARES 2021 will be held as a virtual event. Authors will be asked to present accepted papers remotely.

Submissions are accepted through EasyChair (select track LPW 2021):

Submitted paper must adhere to the ACM Primary Article Template: LaTeX (recommended), Word. To ensure compatibility, please check the approved list of LaTeX packages to be used with the template before creating your document. More information is available in the main conference website submission instructions page.

Program Chairs

  • Paolo Palmieri ‒
    University College Cork, Ireland
  • Luca Calderoni ‒
    Università di Bologna, Italy

Program Committee

  • Antoine Boutet ‒ INSA de Lyon, France
  • Matthew Bradbury ‒ Lancaster University, United Kingdom
  • Zekeriya Erkin ‒ Delft University of Technology, The Netherlands
  • Sébastien Gambs ‒ Université du Québec à Montréal, Canada
  • Prosanta Gope - University of Sheffield, United Kingdom
  • Kimmo Järvinen ‒ University of Helsinki, Finland
  • Ioannis Krontiris ‒ Huawei European Research Center, Germany
  • Jun Pang ‒ University of Luxembourg, Luxembourg
  • Raúl Pardo - IT University of Copenhagen, Denmark
  • Constantinos Patsakis ‒ University of Piraeus, Greece
  • Francesco Regazzoni ‒ University of Lugano, Switzerland
  • Julián Salas Piñón - Universitat Oberta de Catalunya, Spain
  • George Theodorakopoulos ‒ Cardiff University, United Kingdom
  • Rolando Trujillo Rasúa ‒ Deakin University, Australia
  • Isabel Wagner ‒ De Montfort University, United Kingdom

Important dates

All deadlines are at 23:59 Anywhere On Earth (AOE).

  • Submission deadline: April 30 May 17, 2021 (extended)
  • Authors notification: June 07, 2021
  • Camera-Ready Papers Due: June 13, 2021
  • Workshop day: August 19, 2021 (TBC)


Session IChair: Luca CalderoniAugust 19, 17:00 - 18:30
KeynoteStephen B. Wicker"The Impact of AI on Location Privacy"
Paper 1Antoine Boutet and Sonia Ben Mokhtar"Uniqueness Assessment of Human Mobility on Multi-Sensor Datasets"
Paper 2Jenno Verdonck, Kevin De Boeck, Michiel Willocx, Jorn Lapon and Vincent Naessens"A clustering approach to anonymize locations during dataset de-identification"
Paper 3Masakazu Fujio, Kenta Takahashi, Yosuke Kaga, Wataru Nakamura, Yoshiko Yasumura and Rie Yamaguchi"Template Protected Authentication based on Location History and b-Bit MinHash"

Please refer to the full ARES program for details on times and how to connect.


The Impact of AI on Location Privacy

Prof. Stephen B. Wicker, Cornell University, USA

Advances in artificial intelligence have made the ready availability of fine-grained location data increasingly problematic. In this talk we will focus on two branches of AI research – hypothesis testing and constraint satisfaction – to show the social and legal issues that arise from the availability of location data. We begin with a review of the collection of increasingly fine-grained location data by cellular service providers. This collection began from the outset with the use of registration messages to associate handsets with location areas, and has evolved through GPS to the potential for “charting” in 5G massive MIMO systems. We then consider the larger problem of app providers and their collection, packaging, and sale of GPS location data. Though this data is allegedly anonymized, a de-anonymization industry has arisen that eliminates whatever minimal protection existed for the user. Given the availability of such data sets, we will explore the societal and legal impact of hypothesis testing and constraint satisfaction, showing how advanced AI algorithms eliminate legal protections and create clear and present dangers for the consumer.


LWP is co-located with ARES 2021, and was scheduled to be held at TU Wien, Vienna, Austria. However, given the ongoing COVID-19 crisis, the conference has been converted to an all-digital event. Please refer to the main conference website for more information.