I am looking for command line encryption utility for Windows - paid or free. Would prefer it to support AES-256. It has to be something with large user base and actively in development. Need to be able to specify password in command line - not looking to use private/public keys.
It will be used as a part of my backup process. In a nutshell I would just use Winzip or 7-zip encryption but the list of files in encrypted archive is visible and I don't like that. So the plan is to zip files without the password and then encrypt ZIP file itself.
I do use TrueCrypt but it is not convenient for this process - one has to backup whole volume which is not effective storage-wise plus one cannot create encrypted volumes from the command line as far as I know.
Basically looking for something like this: http://hcrypto.sourceforge.net/ but this software doesn't seem to be under active development.