security - how to secure keys for API calls from android device to amazon services -

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so writing app android push data on amazon s3 storage later read. using amazons sdk make calls requires me store public , private keys within app. there way secure them couldn't extracted reverse engineering? possible since making direct calls device? or option run proxy server (on ec2) , pass data through it?

thanks help!

step 1. use https step 2. aes encrypt keys in application

other that, there's not can do, other using proxy server (option mentioned)


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