SSl and SEO
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Does the type of SSL used on a site have any significance to trust and seo ranking?
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I very much doubt it. So long as the SSL certificate is genuine and from a reputable source, that should do the trick.
Really, we're still waiting to see whether SSL is in fact having a positive impact on rankings. Despite what Google's claimed, it's too early to tell without a few more weeks/months data. However, if you're going to make the change or start a new site with SSL from the outset, using a reputable SSL certificate provider will provide all of the trust and SEO benefit you need (if and when that comes).
Hope this helps.
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Completely agree with every point Tom made here.