This article is part of an Essential Guide, our editor-selected collection of our best articles, videos and other content on this topic. Explore more in this guide:
3. - Windows 7 glossary: Read more in this section
Explore other sections in this guide:
BitLocker is an operating system-level extension to Vista that combines on-disk encryption and special key management techniques. The data and the operating system installation are both protected by two-factor authentication, specifically, a hardware key used in conjunction with a long passphrase.