Tom's Hardware has a nice overview about some of the latest ways to secure your data looking specifically at open source solutions that wont lock down your credit card. Since many people presented performance issues for why they don't implement encryption there was also special attention given to how well your system will perform after implementation of encryption. From the article: "At least where LUKS is concerned, performance is hardly an issue - one must expect to pay some penalty for additional encryption facilities that handle unencrypted data transparently. All of these solutions are simple to set up and use on a daily basis, but LUKS is portable across Windows and Linux platforms."
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