This morning I realized I could shave off 3 characters by eliminating
one .join by adding () and converting + to | in the c= initialization.

Also, for Ruby 1.9 only, one can save 8 more characters since string
slices return 1-character strings in 1.9 instead of integers.

I updated http://www.aarongifford.com/base64.rb.txt so it now has the
original and the two improvements.  And it adds a random data test on
Unix-based hosts supporting reading random data from /dev/urandom

Oh, I should add that performance is abysmal, but that obviously
wasn't the goal.   *chuckle*

Aaron out.