These can be used as generic data blocks or value blocks with an optional built-in backup mechanism. Block access is controlled by mutual authentication using sets of secret keys associated with groups of 3 or 15 blocks. The balance of the historic sectors are accessible through contact protocol. You can limit operations to decrement and read commands from the contactless interface, thus blocking credit operations over the contactless interface. Color Die Diffusion Thermal Transfer and most commonly used personalization techniques.
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