web standards - Using a guid for displaying "secure" invoices -

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i've created web site student management (martial arts schools). includes invoicing students. way users can printing invoices , handing them students. i'd create way students go invoice online.

i've been considering using guids students, , using parameter query string invoice. (http://thesite.com/invoice.php?guid=e3d3d122-5ab6-4405-96ec-7c0579710813)

the invoice read-only page, , allow no access rest of site. i'm not worried packet sniffing (i don't believe sniffing traffic in coffee shop concern, if have access random student invoice).

i worried being able guess, or specific set of invoices (i.e. invoices of competitor).

i feel i'm either crazy considering it, or it's relativity standard practice. i'm not sure which. , great sanity check.

thanks

that's good, secure process; lose readability of url, of course, if that's not of concern, that's solution. it's not guessable.

as added security measure, might want put in place logging of invoice accesses.


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