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Incrementality and deck functions

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Incrementality and deck functions
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490
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CC Attribution 2.0 Belgium:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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Protocols in symmetric cryptography are often built from block ciphers, with a fixed input and output size, while variable sizes are handled through their modes of use. Incrementality, namely, the ability to efficiently compute the output for increasing inputs, or to request longer outputs, is often a property of the implementation rather than an explicit feature of a mode.