I've been creating an ActionScript 3 port of the ASCrypt ActionScript 2 component. The project is now up on RIAForge.
You'll find my first conversion attempt (Rijndael) in the software pod to the right. Behind the scenes, I've converted everything in the initial ASCrypt component except for LZW which I can't get to work.
I'm still in the process of uploading files and the sort.
Update: I've now uploaded the files to RIAForge!
Update: And changed the link in my software pod!