The title is more accurate then most people realize. For details of why I say that, look at the issues that have been reported on Crypton's github page. For a correct alternative, look at Tahoe LAFS.

These two are great:

https://github.com/SpiderOak/crypton/issues/21

https://github.com/SpiderOak/crypton/issues/25

"Note that they have been repeatedly factored for such vital purposes as playing games on calculators." You're mean! :)

Also: https://github.com/SpiderOak/crypton/issues/27