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检索条件"主题词=Message authentication code"

共 153 条记录，以下是121-130 订阅

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How to Thwart Birthday Attacks against MACs via Small Randomness

How to Thwart Birthday Attacks against MACs via Small Random...

引用

17th International Workshop on Fast Software Encryption

作者： Minematsu, Kazuhiko NEC Corp Ltd Nakahara Ku Kawasaki Kanagawa 213 Japan

ISBN: (纸本)9783642138577

The security of randomized message authentication code, MAC for short, is typically depending on the uniqueness of random initial vectors (IVs). Thus its security bound usually contains O(q(2)/2(n)), when random IV is n bits and q is the number of MACed messages. In this paper, we present how to break this birthday barrier without increasing the randomness. Our proposal is almost as efficient as the well-known Carter-Wegman MAC, uses n-bit random IVs, and provides the security bound roughly O(q(3)/2(2n)) We also provide blockcipher-based instantiations of our proposal. They are almost as efficient as CBC-MAC and the security is solely based on the pseudorandomness of the blockcipher.

关键词： message authentication code Birthday Bound Mode of Operation

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IEEE 802.11 Wireless LAN Control Frame Protection

IEEE 802.11 Wireless LAN Control Frame Protection

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7th IEEE Consumer Communications and Networking Conference

作者： Myneni, Sushma Huang, Dijiang Arizona State Univ Tempe AZ 85287 USA

ISBN: (纸本)9781424451753

In the present communication scenario of 802.11 wireless local access network there is virtually no way to protect control frames and due to this a range of network allocation vector based denial of service attacks are possible. This paper proposes a novel approach for protecting control frames by generating a unique message authentication code using inter access point protocol for key distribution and key management. Evaluation results show that the denial of service attacks that are possible due to not securing the control frames will be countered by using this solution.

关键词： Inter-Access Point Protocol message authentication code

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Constructing Rate-1 MACs from Related-Key Unpredictable Block Ciphers: PGV Model Revisited

Constructing Rate-1 MACs from Related-Key Unpredictable Bloc...

引用

17th International Workshop on Fast Software Encryption

作者： Zhang, Liting Wu, Wenling Wang, Peng Zhang, Lei Wu, Shuang Liang, Bo Chinese Acad Sci Inst Software State Key Lab Informat Secur Beijing 100190 Peoples R China Grad Univ Chinese Acad Sci Beijing 100049 Peoples R China

ISBN: (纸本)9783642138577

Almost all current block-cipher-based MACs reduce their security to the pseudorandomness of their underlying block ciphers, except for a few of them to the unpredictability, a strictly weaker security notion than pseudorandomness. However, the latter MACs offer relatively low efficiency. In this paper, we investigate the feasibility of constructing rate-1 MACs from related-key unpredictable block ciphers. First, we show all the existing rate-1 MACs are insecure when instantiated with a special kind of related-key unpredictable block cipher. The attacks on them inspire us to propose an assumption that all the chaining values are available to adversaries for theoretically analyzing such MACs. Under this assumption, we study the security of 64 rate-1 MACs in keyed PGV model, and find that 1) 15 MACs are meaningless;2) 25 MACs are vulnerable to three kinds of attacks respectively and 3) 24 MACs are provably secure when their underlying block ciphers are related-key unpredictable. Furthermore, we refine these 24 provably secure rate-1 MACs in Compact PGV model by removing a useless parameter away, and find that the resulting 6 provably secure MACs are in fact equivalent to each other. In the aspect of efficiency, however, the low rate of these secure MACs does not necessarily mean they can run faster than none rate-1 one MACs, due to their large number of key schedules.

关键词： message authentication code Block Cipher Mode of Operation Provable Security

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A Single-Key Domain Extender for Privacy-Preserving MACs and PRFs 1

引用

11th International Conference on Information Security and Cryptology

作者： Yasuda, Kan NTT Corp NTT Informat Sharing Platform Labs Tokyo 1808585 Japan

ISBN: (数字)9783642007309

ISBN: (纸本)9783642007293

We present a, CBC (cipher block chaining)-like mode of operation for MACs (message authentication codes) using a hash function. The new construction iCBC (imbalanced CBC) does not follow, the Merkle-Damgard design but rather iterates the underlying compression function directly in a CBC-like manner. Many of the prior MAC constructions, including HMAC, assume PRF (pseudo-random function) properties of the underlying primitive. In contrast, our iCBC-MAC makes only a PP-MAC (privacy-preserving MAC) assumption about the compression function. Despite the fact that PP-MAC is a strictly weaker requirement than PRF, iCBC-MAC works with a single key like HMAC and runs as efficiently as HMAC. Moreover, iCBC-MAC becomes even faster than HMAC, depending oil the choice of security parameters. Additionally. iCBC-MAC is multi-property-preserving in the sense that it operates as a domain extender for both PP-MACs and PRFs.

关键词： imbalanced cipher block chaining iCBC message authentication code MAC privacy-preserving domain extension

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On Efficient Data Integrity and Data Origin authentication for Wireless Sensor Networks Utilising Block Cipher Design Techniques

On Efficient Data Integrity and Data Origin Authentication f...

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3rd International Conference on Next Generation Mobile Applications, Services, and Technologies

作者： Adekunle, A. A. Woodhead, S. R. Univ Greenwich Dept Comp & Commun Engn Chatham ME4 4TB Kent England

ISBN: (纸本)9780769537863

Analysis of the generic attacks and countermeasures for block cipher based message authentication code algorithms (MAC) in sensor applications is undertaken;the conclusions are used in the design of two new MAC constructs Quicker Block Chaining MAC1 (QBC-MAC1) and Quicker Block Chaining MAC2 (QBC-MAC2). Using software simulation we show that our new constructs point to improvements in usage of CPU instruction clock cycle and energy requirement when benchmarked against the de facto Cipher Block Chaining MAC (CBC-MAC) based construct used in the Tiny Sec security protocol for wireless sensor networks.

关键词： message authentication code data integrity data origin authentication Skipjack wireless sensor networks

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Security of Truncated MACs

引用

4th International Conference on Information Security and Cryptology (Inscript 2008)

作者： Wang, Peng Feng, Dengguo Lin, Changlu Wu, Wenling Chinese Acad Sci Grad Univ State Key Lab Informat Secur Beijing 100049 Peoples R China Inst Software Chinese Acad Sci Stae Key Lab Informat Security Beijing 100080 Peoples R China Fujian Normal Univ Key lab Network Security & Cryptol Fujian 350007 Japan

ISBN: (纸本)9783642014390

In all of the MAC standard documents, the tag truncation is defined. Even if a MAC can be proved to be secure in the sense of unforgeability, the truncated MAC may suffer from sudden loss of security. We propose a new notion of robust unforgeability to address this problem, which is strictly stronger than the notion of unforgeability. We also give some generic methods to turn the unforgeable MAC into robustly unforgeable one. Furthermore we propose a notion of variationally XOR universal hash function, which is strictly weaker than the previously proposed notion of variationally universal hash function by Krovetz and Rogaway, to strengthen the security of Wegman-Carter MACs to be robustly unforgeable.

关键词： message authentication code Robust unforgeability Universal hash function Unforgeability Unpredictability

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A Double-Piped Mode of Operation for MACs, PRFs and PROs: Security beyond the Birthday Barrier

A Double-Piped Mode of Operation for MACs, PRFs and PROs: Se...

引用

28th Annual International Conference on Theory and Applications of Cryptographic Techniques

作者： Yasuda, Kan NTT Information Sharing Platform Laboratories NTT Corporation Japan

ISBN: (纸本)9783642010002

We revisit the double-pipe construction introduced by Lucks at Asiacrypt 2005. Lucks originally studied the construction for iterated hash functions and showed that the approach is effective in improving security against various types of collision and (second-)preimage attacks. Instead, in this paper we apply the construction to the secret-key setting, where the underlying FIL (fixed-input-length) compression function is equipped with a dedicated key input. We make some adjustments to Lucks' original design so that now the new mode works with a single key and operates as a multi-property-preserving domain extension of MACS (message authentication codes), PRFs (pseudo-random functions) and PROs (pseudo-random oracles). Though more than twice as slow as the Merkle-Damgard construction, the double-piped mode enjoys security strengthened beyond the birthday bound, most notably, high MAC security. More specifically, when iterating an FIL-MAC whose output size is n-bit, the new double-piped mode yields an AIL-(arbitrary-input-length-)MAC with security up to O(2(5n/6)) query complexity. This bound contrasts sharply with the birthday bound of O(2(n/2)), which has been the best MAC security accomplished by earlier constructions.

关键词： domain extension unpredictability unforgeability message authentication code MAC birthday bound

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无线感知网路上兼具传输效能之认证方法

无线感知网路上兼具传输效能之认证方法

引用

作者：艾希德国立清华大学

学位级别：硕士

The hardware design miniaturization has led to the introduction of tiny sensing devices with communication and processing capabilities embedded in the physical world or spread throughout our environment. Nowadays sensor not only has the sensing and transmission capability but also processing capability: Sensing + Processing + Transmission = Sensor, whence arises an attractive topic of deciding things that can be processed before transmission in order to reduce communication cost. In this context, the transmission of a message authentication code (MAC) as mechanism for authentication of a message which is frequently used in (WSN) is extremely significant to be considered. There are two lines of actions to this concern, viz, Pairwise MAC (PMAC) which requires adding each MAC to its corresponding message and Single XORMAC (SXMAC) in which one single XORMAC stands for a several messages. The latter leads to less authenticity of the messages but cheaper transmission cost than the former. In contrast, PMAC provides better authenticity but with expensive communication cost than SXMAC. In the middle of this spectacle, for the sake of efficiency and better tradeoff between communication cost and authentication, in this work, we find a balance between the two approaches under consideration by leaning on Reed Solomon error control code and interleaving for sending MACs so that we can reduce the transmission cost and at the same time protect the authenticity of messages as an alternative to the antithesis between SXMAC and PMAC.

关键词： Reed Solomon code interleaving error control codes wireless sensor network message authentication code finite field

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Authenticated Data Compression in Delay Tolerant Wireless Sensor Networks

Authenticated Data Compression in Delay Tolerant Wireless Se...

引用

International Conference on Networked Sensing Systems

作者： Young-Hyun Oh Peng Ning Yao Liu Michael K. Reiter North Carolina State University University of North Carolina at Chapel Hill

ISBN: (纸本)9781424463138;9781424463145

Delay Tolerant Wireless Sensor Networks (DTWSNs) are sensor networks where continuous connectivity between the sensor nodes and their final destinations (e.g., the base station) cannot be guaranteed. Storage constraints are particularly a concern in DTWSNs, since each node may have to store sensed data for a long period of time due to intermittent communication while continuously collecting data. In this paper, we develop novel techniques to seamlessly authenticate and compress sensed data, addressing the storage concerns in DTWSNs in hostile environments by harnessing both temporal and spatial correlation among sensed data. By appropriately using message authentication code (MAC) and one-way hash functions, our techniques allow a node (including intermediate, non-source nodes) to efficiently compress sensed data without regenerating MACs. We explore the trade-off between data distortion and storage reduction provided by compression so that we can reach the maximum data reduction while maintaining desired data quality.

关键词： Data compression Wireless sensor networks data distortion hostile environment Line of nodes COMPRESSED Data Quality message authentication code time periods

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Efficient In-Vehicle Delayed Data authentication Based on Compound message authentication codes

Efficient In-Vehicle Delayed Data Authentication Based on Co...

引用

68th IEEE Vehicular Technology Conference

作者： Nilsson, Dennis K. Larson, Ulf E. Jonsson, Erland Chalmers Univ Technol Dept Comp Sci & Engn SE-41296 Gothenburg Sweden

ISBN: (纸本)9781424417223;9781424417216

Modern vehicles contain an in-vehicle network consisting of a number of electronic control units (ECUs). These ECUs are responsible for most of the functionality in the vehicle, including vehicle control and maneuverability. To date, no security features exist in this network since it has been isolated. However, an upcoming trend among automobile manufacturers is to establish a wireless connection to the vehicle to provide remote diagnostics and software updates. As a consequence, the in-vehicle network is exposed to external communication, and a potential entry point for attackers is introduced. messages sent on the in-vehicle network lack integrity protection and data authentication;thus, the network is vulnerable to injection and modification attacks. Due to the real-time constraints and the limited resources in the ECUs, achieving data authentication is a challenge. In this paper, we propose an efficient delayed data authentication using compound message authentication codes. A message authentication code is calculated on a compound of successive messages and sent together with the subsequent messages, resulting in a delayed authentication. This data authentication could be used to detect and possibly recover from injection and modification attacks in the in-vehicle network.

关键词： In-vehicle network data authentication message authentication code detect recover attacks

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