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"DigiCert Grows SSL/TLS Business Via Verizon Enterprise SSL Deal". www.eweek.com. Retrieved 2015-10-12.  "DigiCert Acquires Verizon Enterprise SSL Business"

Entrust built and sold the first commercially available PKI. Comodo DigiCert GeoTrust neXus RSA Security Safelayer Thawte VeriSign Ascertia "Nortel