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Unicity Distance of Quantum Encryption Protocols

Published 26 Apr 2012 in quant-ph | (1204.5884v5)

Abstract: Shannon presented the concept `unicity distance' for describing the security of secret key encryption protocols against various ciphertext-only attacks. We develop this important concept of cryptanalysis into the quantum context, and find that there exist quantum encryption protocols reusing a short key have infinite unicity distance.

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