I'm doing more research on masking attacks. What I haven't found, yet, is if there's a way to specify through a custom mask if you know what the characters are in specific positions of a password. For example, let's say I know the password is 9 characters long and I know that the first character is an "a" and the last is a "1" at this point. Is there a way to specify this in a mask? Obviously, this could drastically improve the speed of a brute force attempt. The other 7 characters in-between in this example could be defined as "?a" since it could be any character (assuming English).
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