• Journal of the Korea Institute of Information Security & Cryptology
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• v.26 no.1
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• pp.41-47
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• 2016

In Black hat USA 2014, a hacking method to infer the password entry of smartphone or smartpad with google glass in distance is presented. In this paper, we design the secure keypad to protect the key stroke inference attacks with google glass which has unique layout ensuring same input entry but different input value.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.01a
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• pp.205-206
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• 2013

본 논문에서는 스마트폰, 스마트 태블릿, 스마트 패드등과 로봇 구동장치를 결합하여 스마트 로봇 시스템을 효율적으로 개발하는 방법을 소개 한다. 스마트 디바이스 보급은 가속화 되어 많은 분야에 스마트 디바이스를 사용하고 있다. 스마트 디바이스의 CPU의 성능 효율이 좋아 멀티미디어와 인식이 가능하며, 내장된 GPS 칩과 자이로 센서 및 네트워크등 다양한 디바이스를 연결하게 되면 효율적인 정보를 얻어 낼 수 있다. 스마트 디바이스의 판단 처리 및 멀티미디어 출력 기능에 로봇의 구동 장치를 결합하여 스마트 로봇을 만들어 내면 다양한 분야에 효율적으로 사용이 가능하다. 본 논문은 스마트 디바이스에서 인식되는 다양한 패턴과 로봇 구동장치의 효율적인 결합 방법을 설명한다.

• The Journal of the Convergence on Culture Technology
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• v.10 no.3
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• pp.885-890
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• 2024

This study proposes a secure keypad structure that can adapt to screen changes in mobile devices equipped with stretchable display. For this purpose, we compared and analyzed the authentication methods applied to current rigid form factor smartphones with those applied to rollable and bendable display based smartphones, which are the previous stages of stretchable display. Based on the results of this analysis, we identified potential user convenience and security safety issues that may arise in the form factor structure for smart wallets, multitasking, screen expansion and media viewing, and gaming and entertainment applications where stretchable displays will be applied, then proposed a security keypad structure for these form factors. Our keypad structure provides enhanced user convenience and security compared to the structures applied in the smartphone environment based on the conventional rigid display form factor and rollable, bendable display form factor.

• Journal of Convergence for Information Technology
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• v.10 no.8
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• pp.144-151
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• 2020

User-authentication process is necessary in Fintech Service. Especially, authentication on smartphones are carried out through PIN which is inputted through virtual keypads on touch screen. Attacker can analogize password by watching touched letter and position over the shoulder or using high definition cameras. To prevent password spill, various research of virtual keypad techniques are ongoing. It is hard to design secure keypad which assures safety by fluctuative keypad and enhance convenience at once. Also, to reconfirm user whether password is wrongly pressed, the inputted information is shown on screen. This makes the password easily exposed through high definition cameras or Google Class during recording. This research analyzed QWERTY based secure keypad's merits and demerits. And through these features, creating Tetris shaped keypad and piece them together on Android environment, and showing inputted words as Tetris shape to users through smart-screen is suggested for the ways to prevent password spill by recording.

• The Journal of the Korea institute of electronic communication sciences
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• v.6 no.4
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• pp.505-509
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• 2011

Home network system makes it available for controlling inside home and for controlling from outside as well with personal computer, cellular phone or smart phone, by connecting diverse information equipments within home such as lighting, gas, and heating equipments with network. Integrated server and wall-pad, which form home network system, have demerits as saying of being high-priced and of needing to implement network infrastructure. This study suggested the intelligent home network system, which uses smart phone of supplementing these merits of home network system. It substituted high-specification input & output equipment in the currently and widely supplied smart phone for display and touch screen, which are user interface part of the existing wall-pad, and implemented the common wall-pad with low cost by concentrating management and control function of home network on smart phone.

• Journal of Industrial Convergence
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• v.22 no.2
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• pp.63-71
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• 2024

Conventional methods like PIN used in conventional smartphone form factor have not considered the variation in display structure or screen size. As a result, when applied to recent variable display-based smartphones, the secret information input unit may get reduced or enlarged, leading to vulnerabilities for social engineering attacks due to deformation of the display area. This study proposes a secure keypad that responds to changes in display size in rollable and bendable smart phones. Firstly, the security problems that may arise when applying classical authentication methods to new form factors were analyzed, and corresponding security requirements were derived. The proposed security keypad addresses the key input error problem that can occur when the screen size is small. The arrangement and size of keys can be deformed with the spacing suitable for input depending on the display size of rollable and bendable smartphones. The study also considered the problem of leaking input information for social engineering attacks by irregularly distributing key input coordinates. The proposed method provides better user experience and security than existing methods and can be used in smartphones of various sizes and shapes.

• Convergence Security Journal
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• v.22 no.2
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• pp.59-66
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• 2022

Recently, smart home technology has been developed with a great response due to the convenience of home automation. Smart home technology provides various services by connecting various Internet of Things (IoT) and sensors to a home network through wired/wireless networks. In addition, the smart home service easily and conveniently controls lighting, energy, environment, and door cameras through a wall pad. However, while it has become a social issue due to the recent hacking accident of wall pads, personal information leakage and privacy infringement are expected. Accordingly, it is necessary to prepare preventive and countermeasures against security vulnerability factors of wall pads. Therefore, this study expects that it can be used as basic data for future smart home application and response technology development by examining the weak causes and countermeasures related to wall pads.

• Journal of Convergence for Information Technology
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• v.12 no.3
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• pp.38-45
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• 2022

Due to the development of fintech technology, financial transactions using smart phones are being activated. The password for user authentication during financial transactions is entered through the virtual keypad displayed on the screen of the smart phone. When the password is entered, the attacker can find out the password by capturing it with a high-resolution camera or spying over the shoulder. A virtual keypad with security applied to prevent such an attack is difficult to input on a small touch-screen, and there is still a vulnerability in peeping attacks. In this paper, the entire keypad is divided into several groups and displayed on a small screen, touching the group to which the character to be input belongs, and then touching the corresponding character within the group. The proposed method selects the group to which the character to be input belongs, and displays the keypad in the group on a small screen with no more than 10 keypads, so that the size of the keypad can be enlarged more than twice compared to the existing method, and the location is randomly placed, hence location of the touch attacks can be blocked.

• Proceedings of the Korean Society of Computer Information Conference
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• 2013.01a
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• pp.273-276
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• 2013

스마트 폰과 스마트 패드등 스마트 디바이스를 이용한 다양한 앱 응용 프로그램이 배포 되고 있다. 특히 위치 정보를 이용한 다양한 앱용 응용 프로그램이 많이 개발 되고 있다. 본 논문에서는 위치 기반 지역 정보 시스템에 기반된 스마트폰용 고객 마일리지 관리 시스템 구축 방법을 소개 한다. 제안 시스템은 위치 기반으로 지역에 특정 상점을 찾고 해당 상점에 방문하여 이용하면 해당 상점에서 마일리지 또는 쿠폰 등을 단순히 전화 번호 색인을 이용하여 입력하고 해당 정보와 연관하여 지속적인 고객관리를 하는 전체 구조 이다. 제안 시스템을 이용하면 상점 운영자는 종이 또는 프라스틱 카드를 이용하여 고객 관리를 할 필요가 없으며, 고객은 다양한 상점에 다양한 마일리지와 쿠폰을 관리하기 위한 카드를 보관할 필요가 없어진다. 본 논문에서는 위치기반 지역 정보 시스템을 구축하고 해당 지역 정보 시스템과 고객관리를 연결하여 효율적으로 고객을 관리하는 전체 시스템을 설명 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.04a
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• pp.1129-1130
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• 2017

본 연구에서는 현대인들의 하루 중 많은 시간을 차지하는 착좌 생활을 관리하기 위한 롤러블(rollable) 스마트패드를 개발하였다. 이를 위해 PVDF(polyvinylidene fluoride) 필름을 이용한 압전센서(piezoelectric sensor)를 제작하였으며, 센서에서 데이터를 획득하고 및 햅틱 피드백(haptic feedback)을 주기 위한 측정시스템을 개발하였다. 또한, 스마트폰 어플리케이션을 통해 착좌 자세에 대한 정보를 실시간으로 제공하도록 하였다. 제작된 시스템의 착좌 자세 구분 정확도는 10명의 피험자를 대상으로 평가되었으며, 4가지 자세(상체를 좌, 우, 앞, 뒤로 기울인 앉은 자세)에 대한 실험결과 제작된 시스템은 92.5%의 정확도로 제시한 4가지의 자세를 구분하였다.