Knox has been discontinued. Similar apps include TrueCrypt, which is free. Other options are LUKS, Windows BitLocker, Tella and Encrypto. There's no shortage of Disk Encryption Tools like Knox, with more than 25 alternatives for Windows, Linux, Mac, Android and iPhone.
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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If your computer were ever to be stolen, are you certain that your personal information cannot be discovered? Jetico’s BestCrypt software automatically encrypts your files so that nobody can read the data unless they have the right password or keys.
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LUKS Manager provides on-the-fly encryption (AES by default) to virtual folders on Android devices.
Unicode Crypter is a portable tool that encrypts and decrypts any Unicode character from 1 to 1114111!
DCrypt is an encryption and decryption tool that combines in a smart way multiple algorithms. The combination of multiple strong algorithms makes it much more difficult for hackers to get the plain content of the encrypted file without the password.
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:
FileVault full-disk encryption uses XTS-AES-128 encryption with a 256-bit key to help prevent unauthorized access to the information on your startup disk.
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ProxyCrypt is a command line tool that creates encrypted volumes within a file or a hard drive.
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Digital Safe and Password management to protect your data and privacy.
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Zed! protects your personal and sensitive data in encrypted archives on e-mail, on USB sticks and in backups.
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The Gostcrypt project has been launched at the end of 2013 as fork of the (late) Truecrypt project.
