get - Security : primary key parameter in an url -

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i have question security. have website using url that: 

www.mysite.com/product?id=4

on server side, check of course if product id=4 exists , if connected user has right permission see page product. if not user gets error "not authorized".

my problem id=4 primary key of table. , wonder if idea primary key appears in clear in url.

perhaps 

www.mysite.com/product?id=45t6yhyu431azefgthu78n

is better? better transform these parameters in address bar? or not necessary if security managed correctly on server side ?

it depends on identifier refers to. have wonder attacker can information. leaking opaque identifier in url give attacker valuable information? can he/she use information retrieve more information in unsecured way?

if example identifier medical record number (mrn) used in other systems , on numerous paper forms, hipaa violation use identifier in url.

if on other hand identifier points product in inventory table fine use in url fragment or query parameter.


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