The white paper, which is embedded here, outlines Google's corporate security policy, and then how Apps includes information security, physical security and operational security.
Thus, to achieve information security in wireless transmission, physical layer secrecy, which takes advantage of intrinsic characteristics of the wireless channels to achieve transmission security without applying encryption technology, has drawn much attention and been applied into many scenarios [1 4].
One can further refer to a recent survey of physical-layer security which has been investigated from information theory to security engineering in [19].
It is Wyner who firstly investigated the physical-layer security problem in an information-theoretic sense [15] in 1975.
Furthermore, the system discussed in [3] suggests that physical-layer security can be achieved in wireless networks.
While these days we have numerous cryptographic methods with high level security, there is no system with perfect security on physical layer.
There are three main worries: the Presidential Records Act, information security and the president's physical safety.
Information security controls are the technical, physical, administrative, and policy safeguards designed to protect sensitive data.
As to security for its mobile website and apps, Kaiser Permanente says that it aims to protect the privacy and security of personal health information and has "implemented effective programs for information security and compliance … supported by multiple layers of security involving technology, policies, physical security, awareness and identity authentication".
In the last few years, lots of work had been done to enhance the security of physical layer in CRN.
