Well, I think there are just some kind of copy&paste problem :-).
Many descirbition of the different object's method seems
all copy from the box object's, so you would found such things like:
"true if the two boxes are identical"
in cricle object's describition. (And many other objects')
I make them changed and wish I've fix all of them.
And the link in the file:
http://www.zeh.com/local/jfd/crypt.html
seems moved (I can't visit on my location), could it be some other place?
regards
Laser