dorsal/arxiv
View SchemaSecurity aspects of the Authentication used in Quantum Cryptography
| Authors | Jorgen Cederlof, Jan-Åke Larsson |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0611009 |
| URL | https://arxiv.org/abs/quant-ph/0611009 |
| DOI | 10.1063/1.2713455 |
| Journal | IEEE Trans. Inf Theory, 54: 1735-1741 (2008) |
Abstract
Unconditionally secure message authentication is an important part of quantum cryptography (QC). In this correspondence, we analyze security effects of using a key obtained from QC for authentication purposes in later rounds of QC. In particular, the eavesdropper gains partial knowledge on the key in QC that may have an effect on the security of the authentication in the later round. Our initial analysis indicates that this partial knowledge has little effect on the authentication part of the system, in agreement with previous results on the issue. However, when taking the full QC protocol into account, the picture is different. By accessing the quantum channel used in QC, the attacker can change the message to be authenticated. This, together with partial knowledge of the key, does incur a security weakness of the authentication. The underlying reason for this is that the authentication used, which is insensitive to such message changes when the key is unknown, becomes sensitive when used with a partially known key. We suggest a simple solution to this problem, and stress usage of this or an equivalent extra security measure in QC.
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"abstract": "Unconditionally secure message authentication is an important part of quantum\ncryptography (QC). In this correspondence, we analyze security effects of using\na key obtained from QC for authentication purposes in later rounds of QC. In\nparticular, the eavesdropper gains partial knowledge on the key in QC that may\nhave an effect on the security of the authentication in the later round. Our\ninitial analysis indicates that this partial knowledge has little effect on the\nauthentication part of the system, in agreement with previous results on the\nissue. However, when taking the full QC protocol into account, the picture is\ndifferent. By accessing the quantum channel used in QC, the attacker can change\nthe message to be authenticated. This, together with partial knowledge of the\nkey, does incur a security weakness of the authentication. The underlying\nreason for this is that the authentication used, which is insensitive to such\nmessage changes when the key is unknown, becomes sensitive when used with a\npartially known key. We suggest a simple solution to this problem, and stress\nusage of this or an equivalent extra security measure in QC.",
"arxiv_id": "quant-ph/0611009",
"authors": [
"Jorgen Cederlof",
"Jan-\u00c5ke Larsson"
],
"categories": [
"quant-ph"
],
"doi": "10.1063/1.2713455",
"journal_ref": "IEEE Trans. Inf Theory, 54: 1735-1741 (2008)",
"title": "Security aspects of the Authentication used in Quantum Cryptography",
"url": "https://arxiv.org/abs/quant-ph/0611009"
},
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