encrypting filename to be eligible new filename

[Krzysztof Cierpisz]

What is the best way to encrypt a string representing a filename (e.g.
file.txt) with some symmetric algorithm that encrypted string can be
still used as a valid filename (e.g. asdf23radsf234asdlfuyIUIU0) ?

The best would be if I could use the same salt I use for encrypting
content of a given file.

thanks,
chris