http://www.wikidsystems.com/learn-more/features By using asymmetric encryption instead of the usual shared-secret architecture, WiKID has created a truly unique two-factor solution. WiKID is less expensive, easier to implement and maintain and far more extensible than existing solutions. With WiKID you can automate the initial validation/setup of users based on existing trusted credentials. Only WiKID can provide cryptographically-secure mutual authentication and transaction authentication in the same, easy-to-use client. en-us Plone 2.0