The SEO technique is same for the http:// and www. May be the SEO is not enough to rank your site.

hi,
i did use https before for a client for seo but i didn't get any advantage and switched back to http.
if you use https the response time of the website becomes more which harts your seo ranking.

client has hire domain with https due to some security reason so i can't be change it. I am agree to webform suggesstion because https and http website seo is not same effort because of the directory and bookmarking dont accept submission of those website

As far as I know, a https:// website's rank will always display as "private"/unranked - there will not be any actual pagerank.

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I know it is difficult task to do SEO on such site cause mostly directory and social bookmarking sites not accepting it. Any way do article submission, blogs and blog sb and ds.. it helps a lot