CardService
www.CardService.com

CyberCash and ICVerify
www.cybercash.com

Ecstore
www.Ecstore.com

EMS2000
www.EMS2000.com

Entrust
www.Entrust.com

iCat Software
www.icat.com

Internet Factory
www.ifact.com

Kagi
www.kagi.com

OpenMarket
OpenMarket.com

PlugnPay
www.plugnpay.com/default.html

Poor Richard's Web site
www.poorrichard.com

RegNet
www.swregnet.com

SSL-Talk maling list FAQ
www.consensus.com/security/ssl-talk-faq.html

TaxWare
www.TaxWare.com

Thawte
www.Thawte.com

Verisign
www.Verisign.com

WebAgency/Vantage Technologies/VanServ
www.VanServ.com