Configurability
Is there something for the experienced campaigners?
While the programs ship with reasonable defaults, they should be malleable enough to enable advanced users to alter some parameters as per their requirements. There’s not much you can tweak with AESCrypt. It’s a very simple and straightforward program with hardly any configurable options. In contrast, its CLI version does make it possible to tweak a few parameters, such as using a keyfile. EncFS, when used in the expert configuration mode, prompts users for various parameters such as the cipher, its key size, type of filename encoding, and others.
The other three programs are all fairly equally matched in terms of the configurable parameters they offer. KGpg is like every KDE program and highly configurable. You can set default parameters for encryption, decryption, user interface and applet. Many of the encryption options are directly related to gpg. You can force all encryptions to be encrypted with a particular key in addition to the one manually selected. Similarly, you can also choose to encrypt files with untrusted keys.
You can instruct VeraCrypt to cache passwords in memory and also wipe the cache after exiting the program. You can also manually configure default mount options for mounting encrypted volumes and the program can use hardware acceleration to assist AES if the extensions are available in your processor.
While creating a new volume with zuluCrypt you have the option to encrypt with a keyfile instead of key and even use both for more security. You can also change the filesystem of the volume from the default ext4 to vfat, Ntfs, Btrfs and others. Besides English you can use the program in German and French, and also mark volumes as favourites for easier access.