Overview: http://en.wikipedia.org/wiki/3-D_Secure
The UPG Guide for 3D Secure Transaction Delivery
Technical Details: Verified by Visa's "Merchant Implementation Guide"
Concerns :
http://www.computing.co.uk/itweek/news/2214146/industry-lays-secure Verified by Visa and MasterCard SecureCode:or, How Not to Design Authentication ,
How to implement:
http://www.nsoftware.com/kb/tutorials/3dsecure.aspx
Implementations: