There are many alternatives to BoxCryptor Classic for Linux and since it's discontinued a lot of people are looking for a replacement. The best Linux alternative is VeraCrypt, which is both free and Open Source. If that doesn't suit you, our users have ranked more than 25 alternatives to BoxCryptor Classic and seven of them are available for Linux so hopefully you can find a suitable replacement. Other interesting Linux alternatives to BoxCryptor Classic are Cryptomator, TrueCrypt, S.S.E. File Encryptor and Zed!.
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.
Cryptomator provides transparent, client-side encryption for your cloud. Protect your documents from unauthorized access. Cryptomator is free and open source software, so you can rest assured there are no backdoors.
[TrueCrypt is not exactly "Open Source", but the source is available. See the reviews to get more information.]
S.S.E. File Encryptor is a cross-platform encrypter/decrypter of files and folders.
Zed! protects your personal and sensitive data in encrypted archives on e-mail, on USB sticks and in backups.
The Gostcrypt project has been launched at the end of 2013 as fork of the (late) Truecrypt project.
PanBox was developed with the goal of providing a free cloud security solution for the public. It was a joint development of Fraunhofer SIT and Sirrix AG / Rohde & Schwarz - partly funded by the German Federal Ministry of Justice.
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Veracrypt creates disk containers that are then used to store files. Boxcryptor Classic uses EncFS to individually encrypt files.
This makes BC favorable for clouds because then you're uploading the files themselves (encrypted), versus one huge file that could take forever to decrypt.