Your question isn't very clear, but it appears you are trying to encrypt the data from a web form being submitted to a perl CGI, if that is the case all you need to do is make sure the form's ACTION specifies an https (s for secure) URL, and that your webserver supports SSL.

Yes you got it that's exactly what i am trying to do. Sorry, for my short info. I didn't quiet get what you wrote. Can you please include a more thorough explanation.
Thank you.

Install mod_ssl on your Apache webserver. Configure the directory that your script is in to use SSL with the SSLRequireSSL directive. Here is a sample block from my server:

<Directory "/var/www/perl">
    Options FollowSymLinks
    AllowOverride All
    SSLRequireSSL
    Order allow,deny
    Allow from all
    AuthType Basic
    AuthName "Sample encrypted stuff"
    AuthUserFile conf/users
    Require valid-user
</Directory>
[download]

As you can see, I'm using basic (plaintext) authentication using the htpasswd utility and password file. Hope this helps.

-fp