So far I have a Debian NAS with a samba share accessible from a Windows client by user credentials. Within that share I have a folder of images encrypted by ecryptfs. A friend of mine have agreed to "host" a synced copy of my encrypted images on his NAS, but at the same time I want a synced copy/access of decrypted images on my Windows machine.
One idea is if some encryption tool on NAS is able to always maintain two folders of the same data; one encrypted, one decrypted? and then share them accordingly with btsync or similar. disadvantage of this would be double the space used.
Better specified suggestion of above or other solutions to my problem are greatly appreciated!