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Vibration-base key exchange among multiple smart devices on the desk

Arno A., Toyoda K., Watanabe Y., Sasase I., Mathiopoulos P. T.

Image Processing & Communications

2016

Vol. 21, no. 2

33--42

Eavesdropping is a real concern in mobile NFC (Near Filed Communication) pay- ment and data sharing applications. Although DH (Diffie-Hellman) scheme has been widely used in key exchange for secure communica- tions, it may fail in an indoor environment due to the vulnerability against man-in-the-middle attack. In this paper, we propose a vibration- based key exchange among multiple smart de- vices on the desk. In our scheme, devices are assumed to be placed next to each other and each device vibrates with patterns converted from a key to be exchanged and measures them with accelerometer to recover it. Then, each key is recovered from measured acceleration. We implement our scheme with Android smart- phones to show the effectiveness of the pro- posed scheme.

A new adaptable multiple-crack detection algorithm in beam-like structures

Ghadami A., Maghsoodi A., Mirdamadi H. R.

Archives of Mechanics

2013

Vol. 65, nr 6

469--483

In this article, a simple method for detecting, localizing and quantifying multiple cracks in beams using natural frequencies is presented. We model cracks as rotational springs and demonstrate a relationship among natural frequencies, crack locations and depths. The main advantage of our method is that it can detect adaptably the unknown number of cracks intervened. Concise, simple calculations and good accuracy are other advantages of this method. We present a number of numerical examples for several beams to validate our method.