[guardian-dev] Introducing Conceal: Efficient storage encryption for Android

Griffin Boyce griffin at cryptolab.net
Wed Feb 5 05:47:33 EST 2014

   I'm curious as to how OpenSSL's recent hobbling will affect the 
project (or if they're pinning to an older OpenSSL release).  It's 
definitely a cool project, and though it might not *necessarily* be 
bulletproof [1], it seems like a step in the right direction.  It would 
at least raise the difficulty level for apps that want to gain access to 


[1] I'm not optimistic about such things, as a rule

On 2014-02-05 04:08, Josh Steiner wrote:
> Anyone tried this yet?
> https://code.facebook.com/posts/1419122541659395/introducing-conceal-efficient-storage-encryption-for-android/
> Caching and storage are tricky problems for mobile developers because
> they directly impact performance and data usage on a mobile device.
> Caching helps developers speed up their apps and reduce network costs
> for the device owner by storing information directly on the phone for
> later access. However, internal storage capacity on Android phones is
> often limited, especially with lower to mid range phone models. A
> common solution for Android is to store some data on an expandable SD
> card to mitigate the storage cost. What many people don't realize is
> that Android's privacy model treats the SD card storage as a publicly
> accessible directory. This allows data to be read by any app (with the
> right permissions). Thus, external storage is normally not a good
> place to store private information.
> We saw an opportunity to do things better and decided to encrypt the
> private data that we stored on the SD card so that it would not be
> accessible to other apps. To do this efficiently, we built Conceal, a
> set of Java APIs to perform cryptography on Android and make storage
> more secure and lightweight. We created Conceal to be small and faster
> than existing Java crypto libraries on Android while using memory
> responsibly.
> ...
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