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I read the wikipedia article on EAL (http://en.wikipedia.org/wiki/Evaluation_Assurance_Level) but didn't find it very helpful in laying out the steps needed to achieve EAL4. Can someone please lay out in plain English what's involved and what's required?

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This is detailed in the documents available from the Common Criteria portal at http://www.commoncriteriaportal.org/. Specifically, you need to read the Common Criteria Part 3 doc.

It's a lengthy and expensive process, and has plenty of critics; for a good summary see this article: http://gcn.com/articles/2007/08/10/under-attack.aspx

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