Sources of entropy Sample Clauses

Sources of entropy. ‌ We have investigated the Android’s Java API to find the potential entropy sources with results divisible into following categories: Into the first category, we can classify interfaces providing some infor- mation about a device, such as a battery level or signal strength. These sources are not suitable for us because of three different reasons. They do not offer a sufficient range of values – battery level acquires integer val- ues in the range 0-100, signal strength 0-99; the frequency of change is very slow; the values are partially obtainable by an attacker (signal strength can be obtained using a similar device with the same operator in a physically close area, signal strength by observing the device’s life cycle). Another possible source of entropy is a touch-screen. Unfortunately, its utilization requires a big portion of user interaction, which can be achieved either through a longer period of time or by an informed user’s on-demand action. Our application’s character prevents from collecting data through longer period, and at the same time we do not want to force a user to per- form unnecessary additional tasks, hence we decided not to employ this kind of source. Except the touchscreen, there are other input devices regarding contem- porary smartphones that can provide environmental noise, even without the need of user’s interaction. The two most significant ones are probably a microphone and a camera. We chose the utilization of the camera only, as according to [21] the microphone has a min-entropy per one sample equal to 0.5, while this value is exceeded multiple times simply by using a single pixel on a camera preview frame. Device drivers are too low-level for the scope of our thesis, as they are not directly reachable from the Java API. However, native Android’s ran- domness services use as an entropy source the Unix-based random files /dev/random or/and /dev/urandom that utilize the mentioned low- level entropy sources. We use the former file, with respect to the equiva- lence to the designed camera randomness source, to allow comparison.
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