NDC - DDC which is base for working on ATM related software projects.
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http://www.kal.com/Products/Applications/ndc.htm NDC is one of the most widely used ATM communication protocols. Employing a mechanism of states and screens, it places the ATM under a high degree of control of the host computer with each transaction carefully 'managed' by the host-based application. This method of processing ATM transactions has served the banking industry well for the past two decades.
The ATM
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fot the past 25 years single des algorithm was used. But now triple des is used in atm cards for the encryption and decryption.
An ATM machine has a 4-wire, point to point dedicated telephone line which helps in connecting it with the host processor. These types of machines are preferred in places where the user volume is high. They are considered high end and the operating costs of this type of a machine is very high.