Since 2014
A Quantum Cipher with Near Optimal Key-Recycling
BRICS Report Series
View Archive Info| Field | Value | |
| Title |
A Quantum Cipher with Near Optimal Key-Recycling
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| Creator |
Damgård, Ivan B.
Pedersen, Thomas B. Salvail, Louis |
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| Description |
Assuming an insecure quantum channel and an authenticated classical channel, we propose an unconditionally secure scheme for encrypting classical messages under a shared key, where attempts to eavesdrop the ciphertext can be detected. If no eavesdropping is detected, we can securely re-use the entire key for encrypting new messages. If eavesdropping is detected, we must discard a number of key bits corresponding to the length of the message, but can re-use almost all of the rest. We show this is essentially optimal. Thus, provided the adversary does not interfere (too much) with the quantum channel, we can securely send an arbitrary number of message bits, independently of the length of the initial key. Moreover, the key-recycling mechanism only requires one-bit feedback. While ordinary quantum key distribution with a classical one time pad could be used instead to obtain a similar functionality, this would need more rounds of interaction and more communication.
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| Publisher |
Aarhus University
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| Contributor |
—
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| Date |
2005-05-11
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| Type |
info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion — |
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| Format |
application/pdf
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| Identifier |
https://tidsskrift.dk/brics/article/view/21883
10.7146/brics.v12i17.21883 |
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| Source |
BRICS Report Series; No 17 (2005): RS-17 A Quantum Cipher with Near Optimal Key-Recycling
BRICS Report Series; No 17 (2005): RS-17 A Quantum Cipher with Near Optimal Key-Recycling 1601-5355 0909-0878 |
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| Language |
eng
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| Relation |
https://tidsskrift.dk/brics/article/view/21883/19310
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| Rights |
Copyright (c) 2015 BRICS Report Series
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