The concept of 3-D Secure has at least these four implementations:
| organization | their version of 3-D Secure |
| American Express | American Express SafeKey |
| Visa | Verified By Visa |
| MasterCard | MasterCard SecureCode |
| JCB (Japan Credit Bureau) International | J/Secure (for Discover card???) |
As a concept, what this entails is a circumstance in which when you buy something online you are routed to your bank where you have to enter a password at your bank to affirm that you really want to allow the purchase to be. This adds one more security hurdle to prevent another party from abusing your credit card online.
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