SHA1 Question

From: Igor Tebelev (igor.tebelev_at_cox.net)
Date: 03/31/05 

Date: Wed, 30 Mar 2005 19:52:08 -0800

Question to gurus on the board. Maybe even QUIZ. Or maybe just stupid thing
that everybody know except me. Here it is:

Suppose I have some unknow sequence of 7 bytes.
Those bytes are encrypted using SHA1 which produces 20 bytes hash value
Of those 20 bytes first 12 are known.

So, the question is: having first 12 bytes of SHA1 result is there anyway to
find original 7 bytes sequence used to produce that SHA? Brute force
solution is not acceptable: I'm looking for something fast. Any refferences
would be appreciated.

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