Ecommerce applications can be secured in many different ways from simple use of password to use of smart card.
Password
This is the most commonly used technique to protect applications. Username/password is required to access an application. Different users may have access to different portions of the same application.
IP restriction
An application is programmed or configured to accept users from a set of particular IP addresses.
Digital Authentication
A pair of public/private keys are used to protect an application.
Dynamic Password
Each user of an application posses a smart card (the size of a credit card). The smart card displays different password (random numbers) every a few seconds. The time-sensitive password provides much stronger security to an application than simple password protection does.
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