Encryption Question

[danspiegel]

I am building an app that will download encrypted image files, store them in the Android file system, and then open and decrypt them when disconnected from the Internet later.

So, I have these questions:
1. What if any mechanisms are available in Basic4Android for encryption/decryption?
2. I am not sure if you can decompile Android apps. If you can, how can I prevent my encryption method and key from being reverse engineered?

 

[agraham]

1. What if any mechanisms are available in Basic4Android for encryption/decryption?

My encryption library.

2. I am not sure if you can decompile Android apps.

Easily!

how can I prevent my encryption method and key from being reverse engineered?

Being able to see the encryption method should not be a concern. Key security is what you should be worried about. You will have to come up with a solution commensurate with your personal level of paranoia.