LFSR functions are still used in MACs?

From: Adrianz (adrianz_at_email.it)
Date: 06/30/05 

Date: 30 Jun 2005 01:41:01 -0700

Hi,
I am a researcher student.
I have to evaluate the efficiency of a given MAC algorithm, in terms of
security.
My MAC is based on an unkeyed LFSR Hash function, with 60-bit output.

I start to study how collisions based attacks can break my MAC, and
after reading few documents (Preneel, van Oorschot and others) I
realize that collisions attacks are very simple to be deployed on my
system!
A simple attack requires a few minutes!

I note that LFSR Hash functions are not considered in the latest
published documents, so I ask to you if such functions are still used
in applications like the mine.

If these functions are still used, could you link me to some reference
documents?

Thank you all for your help!

Adrianz

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