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it depends on the value of what you are protecting.
if its bra size for victorias secret and there isnt a name or any info to id the person keep it as short as possible
if it hides a homeaddress kill it and opt for user/password+token
guids are nice but not very user friendly to type back in.
if you buy something from RIM you get a /reg.do ID=820874xxx&PD=29962xxx
so thats 18 numbers only if thats easy to retype and represent a high value
so it depends of the value of the data