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Lifetime of Authentication Using Encrypted Tags When the Encryption Key is Partially Known
Linköpings universitet, Matematiska institutionen. Linköpings universitet, Tekniska högskolan.
Linköpings universitet, Matematiska institutionen, Tillämpad matematik. Linköpings universitet, Tekniska högskolan.ORCID-id: 0000-0002-1082-8325
(Engelska)Manuskript (preprint) (Övrigt vetenskapligt)
Abstract [en]

Quantum cryptography is an unconditionally secure key growing technique provided that an unconditionally secure authentication protocol is combined with it. This paper is about the study of the lifetime of a message authentication scheme, where a message to be authenticated is first hashed by a secret–but fixed–Strongly Universal hash function then the output is encrypted with a one-time-pad key to generate a tag for the message. If the onetime-pad is completely secret, then the lifetime is exponential in the tag length. If, however, the one-time-pad key is partially known in each authentication round, as is the case in practical quantum key distribution protocols, then the picture is different; because the adversary’s partial knowledge of the one-time-pad key in each authentication round contributes to his/her ability to identify the secret hash function. We estimate the lifetime of this type of authentication. Here the parameters are the length of the key identifying the secret hash function and the amount of knowledge that Eve has on the one-time-pad. A theoretical estimate is presented, along with experimental results that support it.

Nyckelord [en]
Quantum cryptography, quantum key distribution, authentication, strongly universal hash functions, lifetime
Nationell ämneskategori
Matematik
Identifikatorer
URN: urn:nbn:se:liu:diva-57289OAI: oai:DiVA.org:liu-57289DiVA, id: diva2:324698
Projekt
ICG QCTillgänglig från: 2010-06-16 Skapad: 2010-06-16 Senast uppdaterad: 2016-08-31
Ingår i avhandling
1. Weaknesses of Authentication in Quantum Cryptography and Strongly Universal Hash Functions
Öppna denna publikation i ny flik eller fönster >>Weaknesses of Authentication in Quantum Cryptography and Strongly Universal Hash Functions
2010 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Authentication is an indispensable part of Quantum Cryptography, which is an unconditionally secure key distribution technique based on the laws of nature. Without proper authentication, Quantum Cryptography is vulnerable to “man-in-the-middle” attacks. Therefore, to guarantee unconditional security of any Quantum Cryptographic protocols, the authentication used must also be unconditionally secure. The standard in Quantum Cryptography is to use theWegman-Carter authentication, which is unconditionally secure and is based on the idea of universal hashing.

In this thesis, we first investigate properties of a Strongly Universal hash function family to facilitate understanding the properties of (classical) authentication used in Quantum Cryptography. Then, we study vulnerabilities of a recently proposed authentication protocol intended to rule out a "man-in-the-middle" attack on Quantum Cryptography. Here, we point out that the proposed authentication primitive is not secure when used in a generic Quantum Cryptographic protocol. Lastly, we estimate the lifetime of authentication using encrypted tags when the encryption key is partially known. Under simplifying assumptions, we derive that the lifetime is linearly dependent on the length of the authentication key. Experimental results that support the theoretical results are also presented.

Ort, förlag, år, upplaga, sidor
Linköping: Linköping University Electronic Press, 2010. s. 37
Serie
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1447
Nationell ämneskategori
Matematik
Identifikatorer
urn:nbn:se:liu:diva-57290 (URN)978-91-7393-354-4 (ISBN)
Handledare
Projekt
ICG QC
Tillgänglig från: 2010-06-16 Skapad: 2010-06-16 Senast uppdaterad: 2016-08-31Bibliografiskt granskad

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Abidin, AysajanLarsson, Jan-Åke

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