The link below is to a brief, but simple and enlightening, discussion of the two uses of SSL certificates. Verification and encryption. It is entirely possible, maybe even likely in this case, that the data sent via through an unverified SSL connection is still encrypted. If your browser is indicating that it is, complete with the "lock" indicator, then it probably is. However, that's only half of the story. The other half is the "verification" component, which is discussed at some length in the previous link that I posted. To accept "card not present" credit card transactions online, a company must pass certain verification safe guards via the SSL certificate issuance process, including verification of the ownership of the domain, verification that their WHOIS data is complete and accurate per ICANN standards (which is another story in this industry space), verification that the person applying for the certificate is authorized to do so on behalf of the business, etc. This full menu of verification steps is called "extended validation", and results in issuance of the most highly vetted of the 3 types of SSL certificates. This most rigorously verified SSL certificate is also the industry standard among credit card providers, and as Denise had alluded too, many credit card providers will not authorize online purchases conducted on websites with invalid SSL certificates. Some will, but many won't, but that's not really the point. The point is, there are no assurances that the end recipient of your credit card data is actually the owner / operator of the website, As I'd mentioned before, in all likelihood, they've just moved their certificate over to the new domain and server to be able to take orders for the time being. The possibility does exist, however, at least in theory, that someone could have hacked TTM's old web host server and created a new lookalike site, inclusive of their old SSL certificate. I am NOT suggesting this is the case, but it also cannot be 100% ruled out either, nor can other potential scenarios, until a new, valid certificate is obtained. Also, once again, the financial risk is enhanced in these situations because many financial institutions waive their fraud protections to cardholders who complete transactions via invalid SSL sites. Not all, but some. As a result, customers should check with their card issuer and understand exactly what their exposure is financially.
http://tech.slashdot.org/story/10/06/28/2340237/22-million-ssl-certificates-in-use-are-invalid