I found one method by myself: 

Enhancing Security of Security-Mediated PKI

by One-time ID (http://middleware.internet2.edu/pki05/proceedings/koga-one_time_id.pdf)

Someone else?

It depends on how you define "Secure"

PKI generally provides "Non-repudiation" service other than another Information Security Services.

PKI uses the certification method to ensure the user's identity.

You can ask me by message for further information