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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
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