Once information leaves the scope or enters into a less trusted area, interactive controls no longer work. For example, file sharing via P2P networks requires accessing a lot of information that then travels from system to system on demand. At this point, interactive controls cannot effectively prevent an unauthorized person from accessing that information. Even law enforcement can't effectively extinguish the number of people accessing unauthorized files. However, if the files were protected by process controls, they would not be usable or readable by anyone else. The OSSTMM defines these five controls as
These five controls can be used all together to create the strongest possible control of assets within a process, often as assets are passed between people or travel outside of a secured area. Oftentimes the successful delivery of a service relies upon the loosening of controls to allow for optimal service efficiency. As mentioned in the previous chapter, starting with the maximum amount of controls and loosening as necessary is recommended, rather than doing the opposite and building toward being better protected.
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