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Encypt variable in web address

I have a variable (siteid) which is passed from page to page in the address (eg www.d6online.co.uk?siteid=2753).
This variable is associated to a specific customer. If the user changed the value of the variable in the address bar they would have access to other customer's information. This just can't happen.

What I want to know is what is the best and easiest way of hiding this information from the user.

Hiding the address bar is no good as the properties will still tell them, also I would like the address bar to stay.

Is there a way of encrypting the data and still being able to use it in every page?

Thanks

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shmert

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jetnet

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TaintedGod

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DoppyNL

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wjdashwood

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Yes I am using passwords. I use the username and password they login with to get the siteid from the database. I'll look into sessions, thank you all for helping me out.

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ashoooo

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