In one of my railsapplications I have system for up/downloading files.
Since I don't want people to browse all the files, but anyone should
be able to link to his/her files each file has it's own unique URL -
all pretty standard.

Right now the URL just is /download/sha-sum-of-the-file (since I have
the SHA anyway), but the length of the url is bugging me.

Now - the problem: The SHA1-sum is, as usually, just represented in
base16 which makes it 40 chars long. However, in an url we have at
least a-zA-Z0-9 (and also some special characters) which gives us the
opportunity to represent the SHA-sum in at least base62 which should
make it about half the size.

I know that I in this case just could store an extra little random
string in my database and link to /download/little-string, but that's
not the point here :) I would just like to hear you: How few
(printable) characters can you shorten a SHA-sum down to?
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