This page catalogues how android security has evolved over various versions of android. We strive to catalogue which version introduced a specific security feature or tweaked it as well as which version fixed a specific flaw.
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This page is an ongoing effort and we will try to maintain it in up to date condition to the best of our abilities.
This list is aggregated by Anant Shrivastava and Prashant Mahajan. References where ever applicable are properly placed in the reference section.
Thanks to following folks for helping us with additional inputs.
Feel free to suggest corrections / additions in the list via either comments or a email to AndroidSecurityEnhancement at androidTamer dot com