I'm moving away from Dropbox today. Thanks for this jensen2k.
If you crypt, Dropbox is fine. People need to use encryption. Every popular computer language has encryption routines, scroll through the source code until you find something accessible, twiddle something to personalize it while keeping it functional, perhaps convince yourself it will remain secure, etc, of course be cautious about that. Or simply, there's double encryption, fold it again. Know big 100 meg, gigabyte…
Don't mess with publicly-vetted crypto code - you're far more likely to introduce a weakness. Instead, just follow the documentation and use it correctly.