Both options don't provide the pre-startup system integrity verification offered by BitLocker with a TPM. Starting with Windows 8, an operating system volume password can be used to protect the operating system volume on a computer without TPM. However, this implementation requires the user to insert a USB startup key to start the computer or resume from hibernation. On computers that don't have a TPM version 1.2 or later versions, BitLocker can still be used to encrypt the Windows operating system drive. It works with BitLocker to help protect user data and to ensure that a computer hasn't been tampered with while the system was offline. The TPM is a hardware component installed in many newer computers by the computer manufacturers. BitLocker overviewīitLocker Drive Encryption is a data protection feature that integrates with the operating system and addresses the threats of data theft or exposure from lost, stolen, or inappropriately decommissioned computers.īitLocker provides the maximum protection when used with a Trusted Platform Module (TPM) version 1.2 or later versions. This article provides a high-level overview of BitLocker, including a list of system requirements, practical applications, and deprecated features.

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