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Efficient approximate message authentication scheme

Efficient approximate message authentication scheme

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An approximate message authentication scheme is a primitive that allows a sender Alice to send a source state to a receiver Bob such that the latter is assured of its authenticity, where the source state is considered as authentic if it only undergoes a minor change. Here, the authors propose an efficient scheme for this problem and prove its security under a rigorous model. Our scheme only needs a lightweight computation cost and hence is very efficient. As the authentication message is transmitted over a noisy channel, we also value the channel efficiency (i.e. the coding rate). For a fixed coding method, this is determined by the admissible decoding bit error probability . A larger admits a shorter codeword length and hence a larger coding rate. It turns out that the can be set to be a significantly large constant (determined by the legal distortion level for the source state). Compared with existing schemes, the advantage in is evident.

http://iet.metastore.ingenta.com/content/journals/10.1049/iet-ifs.2016.0256
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