Ki Song Yoon

Privacy Protection in Ubiquitous Computing Based on Privacy Label and Information Flow

The vision of upcoming ubiquitous computing environment allows us to exchange and share information with any parties any time, anywhere if we want. However, the widespread use of computing devices and sensors networked together could be a considerable threat to the privacy of individuals living in the ubiquitous computing environment. In the paper, we investigate privacy issues in the ubiquitous computing environment and present a model of privacy protection and an example architecture to support it. The proposed architecture ensures that individuals not only get benefits and services from ubiquitous environment by freely exchanging and sharing information, but they also preserve their own privacy.

A Study on Digital Signage Interaction Using Mobile Device

An interaction method between user and digital signage systems that are commonly used in digital signage is a touch screen method using the IR sensor. However the touch interaction device using the IR sensor has the advantage of high touch recognition rate, there are many shortcomings that it has high cost and influenced by the noise caused by illumination. In addition, it is hard to interact with user and contents that located in which does not reach the users hand in case of the digital signage consisted of the large scale display devices. In this paper, it is intended to propose and implement a method for interaction with the digital signage display device using a mobile device that is often possessed and used in recent. As interacting with digital signage device using mobile device that installed interaction software, we can avoid the noise caused by light and interact with the large scaled display devices.

Practical Security Improvement of PKCS#5

A public key infrastructure (PKI) is being deployed in a field of network security. PKCS#5 is one of the most popular standards in PKI framework, intended for the practical implementation of password-based cryptography. So, the PKCS#5 encryption must be useful for general software applications within multimedia systems. However, it has a critical weak point in terms of security such as being vulnerable to off-line attacks due to the password-derived encryption key. In this paper, we observe a practical and simple method to improve security of the PKCS#5 encryption without modifying the installed base. The idea is to hide a salt by exploiting several existing schemes.