Transport-level encryption with Tcpcrypt

Matt Blaze, Joan Feigenbaum, and Jack Lacy. Decentralized trust management. In Proceedings 1996 IEEE Symposium on Security and Privacy, page (to appear), May 1996.

Also real cryptographers.

But I should emphasize that while SDSI and to a lesser extent PolicyMaker were influential, these were exceptions to the centralized hierarchical PKI model that dominated cryptography, and they were too late. By 1996 the damage had already been done when Netscape engineers baked the PKI model into their socket encryption protocol, SSL.