G
Geumhwan Cho
Researcher at Sungkyunkwan University
Publications - 19
Citations - 336
Geumhwan Cho is an academic researcher from Sungkyunkwan University. The author has contributed to research in topics: Authentication & Android (operating system). The author has an hindex of 10, co-authored 19 publications receiving 250 citations.
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Proceedings ArticleDOI
On the Effectiveness of Pattern Lock Strength Meters: Measuring the Strength of Real World Pattern Locks
TL;DR: The statistical analysis indicates that about 10% of the pattern locks that were generated without the meter support could be compromised through just 16 guessing attempts, showing significant improvement in security.
Journal ArticleDOI
SENTINEL: A Secure and Efficient Authentication Framework for Unmanned Aerial Vehicles
TL;DR: The proposed SENTINEL framework is specifically designed to minimize the computational and traffic overheads caused by certificate exchanges and asymmetric cryptography computations that are typically required for authentication protocols.
Proceedings ArticleDOI
SysPal: System-Guided Pattern Locks for Android
TL;DR: This work proposes a novel system-guided pattern lock scheme called "SysPal" that mandates the use of a small number of randomly selected points while selecting a pattern, and suggests that the two SysPal policies can help users select significantly more secure patterns compared to the current Android policy.
Proceedings ArticleDOI
An Empirical Study of Click Fraud in Mobile Advertising Networks
TL;DR: This study aims at identifying potential security risks of a type of mobile advertisement where advertisers are charged for their advertisements only when a user clicks (or touches) on the advertisements in their applications.
Journal ArticleDOI
Two-Thumbs-Up: Physical protection for PIN entry secure against recording attacks
DaeHun Nyang,Hyoungshick Kim,Woojoo Lee,Sung bae Kang,Geumhwan Cho,Mun-Kyu Lee,Aziz Mohaisen +6 more
TL;DR: The proposed “Two-Thumbs-Up” (TTU) scheme is resilient against observation attacks such as shoulder-surfing and camera recording, and guides users to protect their PIN information from eavesdropping by shielding the challenge area on the touch screen.