Get Subscriber GUID from the API?

Hi I was hoping to send a campaign where I pass the subscribers GUID in a link out of the email sent to then pull their details back in to a form. i.e. http://www.mydomain.com/enter/<GUID GOES HERE>

I wanted to do this as I thought It'd be safer than passing their email address around on a public facing site for the purposes of a campaign.

Just wondering if this was possible?
Thanks,
Tom

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