As merlyn has pointed out in the past, you can use the following code to generate a unique session_id. If you are going to use it for generating a file to save the CGI object in, be sure to use Taint checks.

use MD5;

sub generate_id {
    return substr(MD5->hexhash(time(). {}. rand(). $$. 'blah'), 0, 16)
+;
}
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You may find this recent discussion relevant.

-Lee

"To be civilized is to deny one's nature."