| 1. |
- Dubrova, Elena, et al.
(författare)
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Lightweight message authentication for constrained devices
- 2018
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Ingår i: WiSec 2018 - Proceedings of the 11th ACM Conference on Security and Privacy in Wireless and Mobile Networks. - New York, NY, USA : Association for Computing Machinery (ACM). - 9781450357319 ; , s. 196-201
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Konferensbidrag (refereegranskat)abstract
- Message Authentication Codes (MACs) used in today's wireless communication standards may not be able to satisfy resource limitations of simpler 5G radio types and use cases such as machine type communications. As a possible solution, we present a lightweight message authentication scheme based on the cyclic redundancy check (CRC). It has been previously shown that a CRC with an irreducible generator polynomial as the key is an -almost XOR-universal (AXU) hash function with = (m + n)/2n-1, where m is the message size and n is the CRC size. While the computation of n-bit CRCs can be efficiently implemented in hardware using linear feedback shift registers, generating random degree-n irreducible polynomials is computationally expensive for large n. We propose using a product of k irreducible polynomials whose degrees sum up to n as a generator polynomial for an n-bit CRC and show that the resulting hash functions are -AXU with = (m + n)k/2n -k. The presented message authentication scheme can be seen as providing a trade-off between security and implementation efficiency.
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| 2. |
- Dubrova, Elena, et al.
(författare)
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Message authentication based on cryptographically secure CRC without polynomial irreducibility test
- 2018
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Ingår i: Cryptography and Communications. - : Springer. - 1936-2447 .- 1936-2455. ; 10:2, s. 383-399
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Tidskriftsartikel (refereegranskat)abstract
- In this paper, we present a message authentication scheme based on cryptographically secure cyclic redundancy check (CRC). Similarly to previously proposed cryptographically secure CRCs, the presented one detects both random and malicious errors without increasing bandwidth. The main difference from previous approaches is that we use random instead of irreducible generator polynomials. This eliminates the need for irreducibility tests. We provide a detailed quantitative analysis of the achieved security as a function of message and CRC sizes. The results show that the presented scheme is particularly suitable for the authentication of short messages.
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| 3. |
- Fertner, Antoni, et al.
(författare)
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Applications of Backscattering for the Study of Twisted Pair Transmission Lines
- 2018
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Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480. ; 66:12, s. 5230-5237
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Tidskriftsartikel (refereegranskat)abstract
- The phenomenon of backscattering in copper cables has been recently observed and initially explicated. It can provide promising techniques to address the problem of loop diagnostic and maintenance. The backscattering is analyzed both in frequency and time domains. To demonstrate the practical use of the phenomenon, we estimate certain properties of the loop using wideband, high-frequency $\selevenf(f)$ measurements performed in the laboratory on real cables. The results corroborate the usefulness and accuracy of the investigated method.
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| 4. |
- Fertner, Antoni, et al.
(författare)
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Backscattering in Twisted-Pair Nonhomogeneous Transmission Lines
- 2018
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Ingår i: IEEE Transactions on Microwave Theory and Techniques. - 0018-9480. ; 66:6, s. 2674-2682
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Tidskriftsartikel (refereegranskat)abstract
- The development of the communication networks tends gradually toward exploiting higher frequencies, sometimes even reaching the lowest microwave band (P-band). As the signal bandwidth used for transmission over twisted-pairs increases, as recommended by G.fast and other broadband systems, new phenomenon was observed, namely, backscattering. Motivated by the measurements of copper cables in frequency band up to 400 MHz, we propose a novel backscattering model. It may be productively applied to the problem of loop diagnostics. The methods to accurately and reliable determine the relevant transmission-line parameters are sine qua non condition to appropriately exploit the potential of short-to-medium range access lines. In this paper, a recursive formulation of the frequency-domain response of the backscattering is used for a space-time characterization. To confirm the practical use of the finding, we evaluate the properties of a loop using wideband, high-frequency S₁₁ measurements of the real cables. These laboratory results confirm the effectiveness and accuracy of the proposed method.
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| 5. |
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| 6. |
- Hjelm, Fredrik, et al.
(författare)
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Inkluderande medborgarskap : Perspektiv på social hållbar samhällsutveckling: exemplet Norrby
- 2016
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- I en tid av polarisering och globalisering blir frågor om gemensamhet och samhörighet, och vad som håller ett samhälle samman, allt viktigare. Syftet med denna skrift är att synliggöra innebörd och utmaningar som rör social hållbar samhällsutveckling. Med utgångspunkt från en specifik stadsdel, Norrby i Borås, exemplifieras och diskuteras den frågan utifrån några skilda perspektiv: hur kultur och delaktighet i samhällsplanering kan främja social hållbar utveckling, äldres livssituation och upplevelse av socialt medborgarskap samt inkluderingsprocesser i utbildning av barn och unga.Innehållet har sin grund i projektet ”Innovationsplattform Norrby”, ett samarbetsprojekt mellan Högskolan i Borås, Borås Stad (inkluderat Borås Energi och Miljö) samt SP (Sveriges Tekniska Forskningsinstitut) som genomförts under perioden 2013-2015. En del av det arbetet har utgjorts av frågor om ”Inkluderande medborgarskap”, vilket gett underlaget för denna rapport. Ett mål i det arbetet har varit att beskriva och analysera hinder och möjligheter för att främja social hållbar stadsutveckling.Inkluderande medborgarskap innebär en upplevelse av samhörighet och reella, likvärdiga förutsättningar att uppnå basala livsmål. Utgångpunkten är ett relationellt perspektiv som sätter fokus på social tillhörighet och samhörighet och som inrymmer kulturella och sociala dimensioner samt tillgång och tillgänglighet till samhälleliga resurser. Grunden för detta är respekten för alla människors lika värde och solidaritet mellan människor. Sammantaget speglar innehållet i rapporten frågor om möjligheter och utmaningar för att skapa ett socialt hållbart samhälle baserat på välfärd och rättvisa, där människor inte enbart har ett formellt medborgarskap utan även upplevelsen av ett socialt medborgarskap.
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| 9. |
- Lindqvist, Anna, et al.
(författare)
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Do we trust the poor? Probing a game paradigm for measuring discriminatory behavior
- 2017
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Rapport (övrigt vetenskapligt/konstnärligt)abstract
- The aim of the present research was to evaluate a computerized version of the Trust game as amethod for studying real-life decisions and discriminatory behavior towards the poor. The stereotype of the poor typically consists of low perceived competence and medium/high perceived warmth. According to the BIAS map (Behaviors from Intergroup Affect and Stereotypes), this should trigger behavioral tendencies of passive harm towards the poor, as compared to the ‘average man’ which served as our control condition, and could be expected to receive facilitatory behavior. The participants (n = 210) played a trust game online with someone portrayed to have either low or medium-high socio-economic status – while they in fact played with the computer. Their task was to decide to what extent they could trust the other player: if both collaborated they would receive the maximum reward. The results indicate that very few participants suspected that they were not playing with an actual person. Some of their responses in the trust game can be interpreted as being in line with the BIAS map, i.e. tendencies of passive harm towards the player with low SES and passive facilitation towards the player with medium-high SES. This suggests that a computerized trust game with a simulated other player may be a viable method for investigating real-life collaboative behavior. Remaining psychometric challenges are discussed.
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