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6.1. Dress in Layers

When it's cold you dress in layers, and security works the same way (Figure 6-1). The outer layer is a firewall, preventing attacks from the Internet. Next, virus detection software scans permitted attachments and other files from bringing in malicious code. Then, operating system security defines users and their permissions. Finally, Excel provides its own security layer.

Data most at risk is that which is shared outside of these layers, such as a workbook posted on a public server. In that case, Excel becomes the primary security layer. Of course, not all data needs the same level (or type) of protection. Therefore, Excel itself provides layers through the following security approaches:


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