Implement two-factor signon without using Google, Yahoo or Facebook

Implement two-factor signon without using Google, Yahoo or Facebook

One incentive for me to consider using Zoho is that it hasn't been the subject of anyone's misgivings about privacy and data aggregation policies (as far as I know). However, when it comes to signing on to Zoho on an untrusted computer without giving away my login details to a keylogger, the only possibilities seem to be the various forms of two-factor authentication offered by the Google, Yahoo or Facebook signon's, and all three of these have attracted controversy at one time or another over privacy issues.

Is there any possibility that Zoho might provide more two-factor sign on mechanisms? One way that this could be done without an enormous development effort would be to use other OpenID providers that use two-factor authentication (not forgetting to provide a way of associating an OpenID with an existing Zoho account). Here are two possibilities:

 Verisign Personal Information Portal
 Clavid

I have seen a few comments from several years ago that Zoho might support more OpenID providers, but nothing has happened about this as far as I can make out.

Regards,
Peter.