Describe what the Common Criteria security framework is and how it is used to evaluate operating systems.

Additionally, describe the following key concepts:

1. Target of Evaluation (TOE)

2. Protection Profile (PP)

3. Security Target (ST)

4. Evaluation Assurance Level (EAL)

Research the current EAL for Windows 2008 and Red Hat 6, and discuss whether you think this level is accurate.