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protection against date/time tempering

hi,

I am creating a C# inventory application in which the user must have to download price book after 7 days. After 7 days the application will give a message to user to download price book. there is a possibility that user change its system date to previous one. how to prevent this? even if the user change its system date the application came to know about it and again ask user to download latest price book. what will be the way around this?

Thanks

yazeem Tuesday, May 29, 2007 6:03 AM

You can't really protect against that. You could contact an Internet time server but an avid user would certainly notice and quickly close the firewall on that. Consider also counting the number of times your app is launched, there's no real bypass for that as long as you encrypt the usage counter properly.

nobugz Tuesday, May 29, 2007 6:42 PM

You can use google to search for other answers

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