Which “good” block encryption algorithm has the shortest output?

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Most block ciphers are going to use larger than 32-bit sized blocks, for security reasons.

However, I found one that is made specifically for what you are doing: Skip32

You may consider using a GUID, but perhaps you have reasons you want to avoid that. (Say, your app is done already.)

Edit:
Actually, if a GUID is permissible, then that gives you a range of 128 bits. You could easily use any other block cipher. The benefit to having a larger space (at the cost of long ID strings) is that you’ll have much more protection from people guessing IDs. (Not that it an order ID by itself should be a security token anyways…)

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