Posted by Jasen Betts on 10/24/12 11:40

On 2006-02-21, julian_m <julianmaisano@gmail.com> wrote:
> Let's say I've a page which is called with arguments a, b and c
>
> test.php?a=val_a&b=val_b&c=val_c
>
> but, i don't want to allow anyone to modify either val_a, val_b or
> val_c
>
> I thought it would be a good idea, to add another argument which could
> combines (through some algorithm) val_a, val_b and val_c, and check it
> every time the page is called.
>
> I was wondering whether any of this exists already. I don't want to
> reinvent the wheel, you know...

sha1, but add it a 'secret value' too.
sha1 is fairly well known but the secret will stop others from forging them.

Bye.
Jasen

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