john-users - Crack the rest of a password if first half of password is known?

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Date: Fri, 20 Jan 2012 15:54:11 +0100
From: Martin Månsson <martin@...adix.se>
To: john-users@...ts.openwall.com
Subject: Crack the rest of a password if first half of password is known?

Hi guys,

If i know half the password in plaintext, lets say, 8 characters out of 12. Is there a way to make JtR crack the 4 remaining characters?

Also if i know the SAP CODEVN B (max 8 alpha numeric case-insensitive) password is there a way to use that to obtain the SAP CODEVN G (max 40 case sensitive alnum + special chars) password?

Thanks,

Martin