“Originally developed by programmers from the National Security Agency, SELinux enforces a much finer-grained series of mandatory access control policies.  the other big security enhancement introduced in Android 4.3 is a more robust way to store cryptographic credentials used to access sensitive information and resources.  ‘With the keychain enhancements, the system-wide keys are bound to a hardware-based root of trust process devices that support this,’ said Pau Oliva Fora, senior mobile security engineer at viaForensics. ‘The phone needs to have a secure element such as a Trusted Platform Module so that private keys can’t be stolen.'”

http://arstechnica.com/security/2013/07/google-strengthens-android-security-muscle-with-nsa-developed-protection/

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