Examining Privacy Leakage from Online Used Markets in Korea

Hyunsu MUN  Youngseok LEE  

Publication
IEICE TRANSACTIONS on Information and Systems   Vol.E99-D   No.4   pp.891-894
Publication Date: 2016/04/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2015ICL0003
Type of Manuscript: Special Section LETTER (Special Section on Information and Communication System Security)
Category: Privacy protection in information systems
Keyword: 
privacy,  online used market,  community,  web,  crawl,  Facebook,  

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Summary: 
Online used markets such as eBay, Yahoo Auction, and Craigslist have been popular due to the web services. Compared to the shopping mall websites like eBay or Yahoo Auction, web community-style used markets often expose the private information of sellers. In Korea, the most popular online used market is a website called “Joonggonara” with more than 13 million users, and it uses an informal posting format that does not protect the users' privacy identifiable information. In this work, we examine the privacy leakage from the online used markets in Korea, and show that 45.9% and 74.0% of sample data expose cellular phone numbers and email addresses, respectively. In addition, we demonstrate that the private information can be maliciously exploited to identify a subscriber of the social network service.