What's the significance of the Hash Key as it relates to multiple site collections?

One thing I've noticed is for each site collection I've installed the ExCM, I have to set the Hash Key in the Delegation Setting section.  What's the impact of using the same Hash Key for all site collections versus using a different Hash Key for each site collection? 

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    Matthew McBride

    The Hash Key value is used to encrypt data on the query string when an invitation notification is sent. This ensures the values of the registration URL have not been tampered with. If a value is changed, say the invitation id, the registration will fail. There is no impact of using the same hash key for all site collections. However, if you do change the Hash Key value while there are still pending registration, the pending registrations will become invalid. You will need to resend the invitations.

    Jeremy Luerkens
    Manager, Software Production
    SharePoint Solutions
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