>> MVS B1 SUPPORT:  Selected MVS/ESA products, collectively called a
>> trusted computing base (TCB), were evaluated by the United States
>> Department of Defense's National Computer Security Center (NCSC),
>> found to meet the criteria for a B1 level of trusted system, and>

> Microsoft has only achieved a C2.

And only then with the network and keyboard (!) detached.

The reason IBM hasn't repeated the exercise (apart from some issues with USS) is the 
effort
involved.  It's gargantuan.

--
  Phil Payne
  http://www.isham-research.com
  +44 7785 302 803

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