The implementation of wash, rinse, and spin technique in accelerometer's data processing on android smartphone to generate stream keys

摘要

The needs of random key generator on Android smartphones grow in line with applications which provide cryptographic services. Overcoming this we can use sensor on Android itself to be a key generator, that called Accelerometer sensor. However, raw data generated from this sensor are weak data sources because they have many slow drifts. According to those background, Hong & Liu proposed the protocol that consists of three data-processing techniques, it Wash, Rinse, and Spin. This study implements the protocol by using the accelerometer sensor in android smartphone. It uses SDLC method to build an application. Differentiate process used in Wash step, FFT Radix-2 and SecureRandom() in Rinse step then Pseudo Random Bit Generator (PRBG) based on Chaotic Logistic Map used in the Spin step. Some tests such as Unit, Performance, and Usability testing are conducted to evaluate the application. The uit testing result shows the protocol is properly applied to Android-based random key generator application. The performance testing result show it needs 8.2 milliseconds to generate a 128-bit key. It graphically transforms and shuffles data on vary key's lengths and device condition. It has 4.8 milliseconds average time to save the generated keys into the smartphone's memory.