Ada Software Tools Interfaces: Workshop, Bath, July 13–15, by Peter J. L. Wallis

By Peter J. L. Wallis

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It calls each Service Payment Terminal in regular intervals (or gets called from the Service Payment Terminals) and collects payment records for later processing in the Clearing and Administration System. The Clearing and Administration System is the last stage in the background operation. It processes all payment records, transfers the money to the merchant's bank accounts, and controls the loading of cards. All payment transactions are done off-line. The Service Payment Terminal creates a record for each transaction.

1 in June of 2000. The card is a combination of a traditional ISO 7816-4 compliant operating system and a programmable platform. The core provides a file system, access control, 110, cryptographic services, an API, and a selection of ISO commands. An optional runtime environment allows the addition of custom-developed applications. 3 Smart Card Operating Systems • •• 33 Microsoft provides the developers with all components needed to write the application. 7 are optional. With the Smart Card for Windows product, Microsoft enables other companies to create a card operating system using a Windowsbased smart card toolkit for Visual Basic.

These include slicing off layers of the chip to optically read out data, manipulating the voltage or clock to make the processor fail, attacks using high temperature or X-rays, and several others. Sophisticated counter measures are applied to guard the chip against the various attacks. For example, passivation layers are added to prevent analysis in combination with slicing off layers of the chip. Address lines and the memory cells of the chip are arranged in unusual patterns to make the physical examination harder.

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