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Public Key Infrastructure

Codenomicon DEFENSICS preemptive security and robustness testing solutions empower customers to mitigate unknown and published threats in products and services prior to release or deployment - before systems are exposed, outages occur and zero-day attacks strike.
CygnaCom is an information security firm specializing in enabling access to US and Global Government markets by conducting Common Criteria, FIPS 140, SCAP certifications, and achieving UC APL listing.
EJBCA is an enterprise class PKI Certificate Authority software, built using Java (JEE) technology. It is a robust, high performance, platform independent, flexible, and component based CA to be used stand-alone or integrated in other JEE applications.
StartSSL - StartCom free SSL client, S/Mime, server, domain controller, smartcard certificates.
Symantec & trade, authentication services powered by VeriSign provides solutions that allow companies and consumers to engage in communications & commerce online with confidence; include SSL certificates, extended validation SSL, two-factor authentication, identity protection, code signing & public key infrastructure (PKI).