Multi Password Way of Management

Lets say I call up the customer care of my credit card company. Before interacting with me, the customer care would ask me a few queries to verify my identity like:

• Card Number
• Date of Birth
• Mothers Maiden Name
• House Address
• Mobile Number

After I have given satisfactory answers to these questions, they would consider my identity proved and answer my queries.

You create a many-to-one relation between the customer and the product. If the many is verified by the customer, then he / she has got the access to the product.

This way is used when you need to ensure with a good probability that the product is being associated with the right customer, so instead of having a single token, there are multiple different tokens associated with the product.