I need a ready to use c++ library for transfering files via sftp in a windows MFC application. I implement ftp functions in my application using the MFC CFtpConnection class, but need to add secure ftp. The one I have found so far is Chilkat. It looks good, but I wasn't able to find any info on whether it has a lot of overhead or is kind of messy. Anyone have any experience with it? Anyone know of another library that might be better? Obviously, it would be nice if there was a free one available.