Here is the Nexus 7, piece by piece

The Technology Review in a detailed publication on developments in the iPhone security issue noting that Apple is now accepting government and corporate organizations with the implementation of internationally accepted standards on the issue of encryption of data from a iOS device.

Essentially, the algorithm Apple uses AES (Advanced Encryption Standard), a system that was published in 1998, adopted by the U.S. government in 2001 and used by the NSA to store confidential data. After a decade of extensive analyzes of the AES is unbreakable - is, indeed, so strong that no computer in the near future can not "break" a truly random 256-bit AES key.

"There are many issues regarding the export of data from iOS devices," says Amber Schroader, CEO of Paraben, a company providing forensic services for smartphones. "We had many civil cases are unable to resolve because of the encryption that prevent us."

You can read the entire article here and you will find recent multi-page document of Apple, which analyzes largely iOS security here .