Cracking decrypted file when knowing partial contents

From: Adfa (adfa_at_noname.com)
Date: 04/20/04 

Date: Tue, 20 Apr 2004 22:19:21 +1000

Would it be easier to crack an encrypted file if the cracker knew some of
the contents of the file?

For example, an encrypted MS Word file where the cracker knew word-for-word
a few paragraphs of the document, but not necessarily the exact byte
postions of those paragraphs in the file.

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