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Title: The right information in the right size package
Review: While "All-In-One" has a very comprehensive outline of security concepts, I feel the "Prep Guide" is a better tool for focusing on the test for someone experienced in the field. The cryptography chapter is the clearest and readable overview of crypto concepts I've seen. For example, while "All-In-One" states that for 10 people, a person will have to have 45 different keys to support the symmetric encryption method - and for 100 - you'd need 4,950 symmetric keys (page 516), but doesn't explain the calculation. The "Prep Guide" shows the formula, n(n-1)/2 (page 162).There are other examples of this, which make the Prep Guide a more useful tool for the security practitioner in studying for the exam.
