Now apparently this paper http://accepted.100871.net/jni.pdf http://accepted.100871.net/jni.pdf ("Android Low Entropy Demystified" by Yu Ding, Zhuo Peng and Cha

Now apparently this paper http://accepted.100871.net/jni.pdf http://accepted.100871.net/jni.pdf ("Android Low Entropy Demystified" by Yu Ding, Zhuo Peng and Chao Zhang, from 2014) says that the android random number generator does not have a lot of entropy, this means it is not very secure (note to self: don't buy any stuff online from an android phone) Interesting if this insecurity of the phone OS is a feature or a design requirement ... However for use with Google's servers is all pretty much secure, this is certainly a design requirement.