Windows BitLocker is not available for Linux but there are plenty of alternatives that runs on Linux with similar functionality. The best free Linux alternative is VeraCrypt, which is also Open Source. If that doesn't suit you, our users have ranked more than 100 alternatives to Windows BitLocker and 18 are free and available for Linux so hopefully you can find a suitable replacement. Other interesting free Linux alternatives to Windows BitLocker are TrueCrypt, LUKS, GostCrypt and Luksus.
Ensure your data's security by encrypting entire partitions, storage devices, or system drives with VeraCrypt. Benefit from transparent and automatic real-time encryption, hardware acceleration on modern processors, and robust security algorithms that are resistant to brute-force attacks.
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[TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.]
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LUKS is the standard for Linux hard disk encryption. By providing a standard on-disk-format, it does not only facilitate compatibility among distributions, but also provides secure management of multiple user passwords.
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The Gostcrypt project has been launched at the end of 2013 as fork of the (late) Truecrypt project.
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The realcrypt application in the RPM Fusion repo is an encryption application based on truecrypt, freely available at http://www.truecrypt.org/. It differs from truecrypt in only the following ways:
Zed! protects your personal and sensitive data in encrypted archives on e-mail, on USB sticks and in backups.
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EncFS provides an encrypted filesystem in user-space. It runs without any special permissions and uses the FUSE library and Linux kernel module to provide the filesystem interface. You can find links to source and binary releases below.
Xecrets Ez is an easy to use personal desktop application available for Windows, Mac and Linux. It is 100% compatible with AxCrypt, but is less complex without the bells and whistles.
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The Gnome Encfs Manager is an easy to use manager and mounter for encfs stashes. It allows you to create encrypted directories, any file that is placed in such a directory will be encrypted.
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