  We aim to access entropy sources available within smartphones in order to
construct and evaluate a random number generator which is competitive in
comparison with existing and proven random number generators. A prototype
utilizing the herein proposed algorithm shall generate data that can be tested
against the Statistical Test Suit provided by NIST. Although our initial
intention of using cosmic radiation failed, we were able to extract randomness
from incoming video and audio sources. We found that it is possible to access
these sources of entropy utilizing sensors from smartphones resulting in 15 out
of 15 successful passed tests within the Statistical Test Suit. We also found
that wrong methods of sensor data collection using our prototype eventually
generates weak random numbers and fails NIST's Statistical Test Suit. Finally,
we suggest that in order to reach the initial goal of providing a
smartphone-based true nondeterministic random number generator the detection of
muons shall be researched.
