Android Encryption with the Android Cryptography API
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this is the standard crypto analysis for android. If you are up for the simple off-the-shelf encryption provided by Android Cryptography APIs, then this introductory tutorial will show you where to find the resources, how to check if some algorithms are supported on your devices programmatically, and provide examples of a couple of popular algorithms in AES and RSA. A quick description is also given to explain the general difference in symmetric and asymmetric concepts. This is, however, not a discussion regarding the possibility how these algorithms can be compromised by experienced hackers. That is way beyond what this short tutorial can cover.