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Perimeter

10/18/2011
10:01 PM
Taher Elgamal
Taher Elgamal
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On Trusting Certificate Authorities

The time has come for a way to vet CAs by reputation

I get questions almost daily about the weaknesses of the certificate authorities (CAs) that are today “trusted” in every browser. The decision we made years ago to use PKI as the cornerstone for security in SSL and the early Web is under attack because of the poor practices of some CAs and the fact that we could not tell or remove these from our trusted lists without patching the browsers.

We knew since the beginning that the trust model in browsers is not sufficient. Almost every online business now has some reputation elements that the Internet can help establish and inform the users. It is ironic that the businesses that are the core of the trust of the entire e-commerce world lack any reputation support.

It could be time for some Internet entity to start to collect reputation data on CAs, and serve users and other entities in that regard. As long as root keys are hard-coded into browsers, we are not able to revoke CAs, which is obviously a missing component of any PKI system. So, in the meantime, can we at least help the community?

Eventually, PKI implementations in browsers need to be revisited. Browser vendors are, in fact, the root of trust, regardless of opinions and business practices. And as such, it would have been so much easier for the browser to sign CA root keys instead of just hard-coding.

Recognized in the industry as the "inventor of SSL," Dr. Taher Elgamal led the SSL efforts at Netscape. He also wrote the SSL patent and promoted SSL as the Internet security standard within standard committees and the industry. Dr. Elgamal invented several industry and government standards in data security and digital signatures area, including the DSS government standard for digital signatures. In addition to serving on numerous corporate advisory boards, Dr. Elgamal is the Chief Security Officer at Axway, a global provider of multi-enterprise solutions and infrastructure. He holds a Ph.D. and M.S. in Computer Science from Stanford University. View more of his blog posts here.

 

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