Temporary Internet Files - security Risk in portal?

Hi Experts,

I have uploaded a word document in to my personal documents folder, then i tried to open it and it automatically created a copy of the file in the temporary folder. I logged off , but still the document remains in the temp folder.

How do we fix this problem? it is a huge security risk for the portal users as someone can easily take the confidential information from the temp folder. Implementing as SSL portal (https) will only solve this problem?

Please let me know how to solve this issue.

Thanks,

Vijay