scholarly journals Multiple Observations for Secret-Key Binding with SRAM PUFs

Entropy ◽  
2021 ◽  
Vol 23 (5) ◽  
pp. 590
Author(s):  
Lieneke Kusters ◽  
Frans M. J. Willems
Keyword(s):  
Error Correcting Code ◽  
Ldpc Code ◽  
Soft Decision ◽  
Secret Key ◽  
Multiple Observations ◽  
Reconstruction Performance ◽  
New Strategy ◽  
The One ◽  
Helper Data ◽  
Data Scheme

We present a new Multiple-Observations (MO) helper data scheme for secret-key binding to an SRAM-PUF. This MO scheme binds a single key to multiple enrollment observations of the SRAM-PUF. Performance is improved in comparison to classic schemes which generate helper data based on a single enrollment observation. The performance increase can be explained by the fact that the reliabilities of the different SRAM cells are modeled (implicitly) in the helper data. We prove that the scheme achieves secret-key capacity for any number of enrollment observations, and, therefore, it is optimal. We evaluate performance of the scheme using Monte Carlo simulations, where an off-the-shelf LDPC code is used to implement the linear error-correcting code. Another scheme that models the reliabilities of the SRAM cells is the so-called Soft-Decision (SD) helper data scheme. The SD scheme considers the one-probabilities of the SRAM cells as an input, which in practice are not observable. We present a new strategy for the SD scheme that considers the binary SRAM-PUF observations as an input instead and show that the new strategy is optimal and achieves the same reconstruction performance as the MO scheme. Finally, we present a variation on the MO helper data scheme that updates the helper data sequentially after each successful reconstruction of the key. As a result, the error-correcting performance of the scheme is improved over time.

scholarly journals Multiple Observations for Secret-Key Binding with SRAM PUFs

2021 ◽  
Author(s):  
Lieneke Kusters ◽  
Frans M.J. Willems
Keyword(s):  
Error Correcting Code ◽  
Ldpc Code ◽  
Soft Decision ◽  
Secret Key ◽  
Multiple Observations ◽  
Reconstruction Performance ◽  
New Strategy ◽  
The One ◽  
Helper Data ◽  
Data Scheme

We present a new Multiple-Observations (MO) helper data scheme for secret-key binding to an SRAM PUF. This MO scheme binds a single key to multiple enrollment observations of the SRAM PUF. Performance is improved in comparison to classic schemes which generate helper data based on a single enrollment observation. The performance increase can be explained by the fact that the reliabilities of the different SRAM cells are modeled (implicitly) in the helper data. We prove that the scheme achieves secret-key capacity for any number of enrollment observations, and, therefore it is optimal. We evaluate performance of the scheme using Monte Carlo simulations, where an off-the-shelf LDPC code is used to implement the linear error-correcting code. Another scheme that models the reliabilities of the SRAM cells is the so-called Soft-Decision (SD) helper data scheme. The SD scheme considers the one-probabilities of the SRAM cells as an input, which in practice are not observable. We present a new strategy for the SD scheme that considers the binary SRAM-PUF observations as an input instead and show that the new strategy is optimal and achieves the same reconstruction performance as the MO scheme. Finally, we present a variation on the MO helper data scheme that updates the helper data sequentially after each successful reconstruction of the key. As a result, the error-correcting performance of the scheme is improved over time.

scholarly journals The stratified disc wind of MCG-03-58-007

2020 ◽  
Vol 500 (1) ◽  
pp. 291-300
Author(s):  
V Braito ◽  
J N Reeves ◽  
P Severgnini ◽  
R Della Ceca ◽  
L Ballo ◽  
...  
Keyword(s):  
Absorption Line ◽  
Velocity Component ◽  
Column Density ◽  
Accretion Disc ◽  
Line Profiles ◽  
Lower Velocity ◽  
Multiple Observations ◽  
Two Phases ◽  
The One ◽  
High Column

ABSTRACT Past Suzaku, XMM–Newton, and NuSTAR observations of the nearby (z = 0.03233) bright Seyfert 2 galaxy MCG-03-58-007 revealed the presence of two deep and blue-shifted iron K-shell absorption line profiles. These could be explained with the presence of two phases of a highly ionized, high column density accretion disc wind outflowing with vout1 ∼ −0.1c and vout2 ∼ −0.2c. Here we present two new observations of MCG-03-58-007: one was carried out in 2016 with Chandra and one in 2018 with Swift. Both caught MCG-03-58-007 in a brighter state ($F_{{\mathrm{2}-10\, keV}} \sim 4 \times 10^{-12}$ erg cm−2 s−1) confirming the presence of the fast disc wind. The multi-epoch observations of MCG-03-58-007 covering the period from 2010 to 2018 were then analysed. These data show that the lower velocity component outflowing with vout1 ∼ −0.072 ± 0.002c is persistent and detected in all the observations, although it is variable in column density in the range NH ∼ 3–8 × 1023 cm−2. In the 2016 Swift observation we detected again the second faster component outflowing with vout2 ∼ −0.2c, with a column density ($N_{\mbox{H}}=7.0^{+5.6}_{-4.1}\times 10^{23}$ cm−2), similar to that seen during the Suzaku observation. However during the Chandra observation 2 yr earlier, this zone was not present (NH < 1.5 × 1023 cm−2), suggesting that this faster zone is intermittent. Overall the multi-epochs observations show that the disc wind in MCG-03-58-007 is not only powerful, but also extremely variable, hence placing MCG-03-58-007 among unique disc winds such as the one seen in the famous QSO PDS456. One of the main results of this investigation is the consideration that these winds could be extremely variable, sometime appearing and sometime disappearing; thus to reach solid and firm conclusions about their energetics multiple observations are mandatory.

A New Strategy for the One Pot Synthesis of (Aryloxyimino)Ethylcoumarins Promoted by CuCl2

2012 ◽  
Vol 36 (1) ◽  
pp. 5-8 ◽  
Author(s):  
Gargi Pal ◽  
Pranabes Bhattacharyya ◽  
Arunima Medda ◽  
Asish R. Das
Keyword(s):  
One Pot ◽  
One Pot Synthesis ◽  
New Strategy ◽  
The One

A Rathole: Foucault, Freud, and the Problem of Isolation

2021 ◽  
Vol 31 (1) ◽  
pp. 1-28
Keyword(s):  
The Other ◽  
Obsessive Compulsive ◽  
Compulsive Disorder ◽  
Psychological Barriers ◽  
Obsessional Neurosis ◽  
Wrong Side ◽  
New Strategy ◽  
Affective Experiences ◽  
The One ◽  
Traditional Strategy

The article discusses the problem of isolation and draws a parallel between two different approaches to it - Michel Foucault’s archeology of power and Sigmund Freud’s psychoanalysis. Foucault’s perspective is exemplified by his critique of the strategies of power as they were applied to the epidemics of leprosy and bubonic plague. For leprosy there was an undifferentiated exclusionary space, while the the plague brought about a segmented space for confinement. The passage from the one strategy to the other marks the development of the disciplinary model of power: leper colonies are transformed into prisons and psychiatric wards. Freud’s approach is examined in his treatment of the Rat Man, the patient whose analysis prompted Freud to formulate his theory of obsessional neurosis, or obsessive-compulsive disorder (OCD). The article emphasizes the relevance of the problem of OCD to the COVID-19 pandemic of 2020. The traditional strategy of power applied to leprosy was isolation by means of exile from towns, while for the plague isolation meant shutting towns down with their inhabitants each in their own place as if imprisoned. COVID-19 brought about a new strategy of self-isolation which entails creating physical and psychological barriers together with social distancing. Obsessional neurosis is evolving from an individual pathology into a kind of collective one: epidemiology influences mentality. In conclusion, the article takes up two literary examples - Roman Mikhailov’s text “The Wrong Side of a Rat,” and Varlam Shalamov’s story “Lepers,” from the Kolyma Stories collection - in which breaking out of isolation, disease and infection are presented as alternative affective experiences.

Hiding Data in Plain Sight: Towards Provably Unbreakable Encryption with Short Secret Keys and One-Way Functions

2021 ◽  
Author(s):  
Mircea-Adrian Digulescu
Keyword(s):  
Encryption Scheme ◽  
Secret Key ◽  
Small Probability ◽  
Random Data ◽  
Computing Power ◽  
Plain Text ◽  
Secret Keys ◽  
The One ◽  
One Way Function ◽  
The Cost

It has long been known that cryptographic schemes offering provably unbreakable security exist, namely the One Time Pad (OTP). The OTP, however, comes at the cost of a very long secret key - as long as the plain-text itself. In this paper we propose an encryption scheme which we (boldly) claim offers the same level of security as the OTP, while allowing for much shorter keys, of size polylogarithmic in the computing power available to the adversary. The Scheme requires a large sequence of truly random words, of length polynomial in the both plain-text size and the logarithm of the computing power the adversary has. We claim that it ensures such an attacker cannot discern the cipher output from random data, except with small probability. We also show how it can be adapted to allow for several plain-texts to be encrypted in the same cipher output, with almost independent keys. Also, we describe how it can be used in lieu of a One Way Function.

Lightweight mediated semi-quantum key distribution protocol

2019 ◽  
Vol 34 (34) ◽  
pp. 1950281 ◽  
Author(s):  
Chia-Wei Tsai ◽  
Chun-Wei Yang ◽  
Narn-Yih Lee
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Trojan Horse ◽  
Third Party ◽  
Secret Key ◽  
Photon Detector ◽  
Transmission Strategy ◽  
Secret Keys ◽  
The One ◽  
Trojan Horse Attack

Classical users can share a secret key with a quantum user by using a semi-quantum key distribution (SQKD) protocol. Allowing two classical users to share a secret key is the objective of the mediated semi-quantum key distribution (MSQKD) protocol. However, the existing MSQKD protocols need a quantum user to assist two classical users in distributing the secret keys, and these protocols require that the classical users be equipped with a Trojan horse photon detector. This reduces the practicability of the MSQKD protocols. Therefore, in this study we propose a lightweight MSQKD, in which the two participants and third party are classical users. Due to the usage of the one-way transmission strategy, the proposed lightweight MSQKD protocol is free from quantum Trojan horse attack. The proposed MSQKD is more practical than the existing MSQKD protocols.

scholarly journals SECURITY OF A NEW TWO-WAY CONTINUOUS-VARIABLE QUANTUM KEY DISTRIBUTION PROTOCOL

2012 ◽  
Vol 10 (05) ◽  
pp. 1250059 ◽  
Author(s):  
MAOZHU SUN ◽  
XIANG PENG ◽  
YUJIE SHEN ◽  
HONG GUO
Keyword(s):  
Quantum Key Distribution ◽  
Key Distribution ◽  
Continuous Variable ◽  
Excess Noise ◽  
Noisy Channel ◽  
Quantum Channels ◽  
Secret Key ◽  
Transmission Distance ◽  
The Family ◽  
The One

The original two-way continuous-variable quantum-key-distribution (CV-QKD) protocols [S. Pirandola, S. Mancini, S. Lloyd and S. L. Braunstein, Nat. Phys. 4 (2008) 726] give the security against the collective attack on the condition of the tomography of the quantum channels. We propose a family of new two-way CV-QKD protocols and prove their security against collective entangling cloner attacks without the tomography of the quantum channels. The simulation result indicates that the new protocols maintain the same advantage as the original two-way protocols whose tolerable excess noise surpasses that of the one-way CV-QKD protocol. We also show that all sub-protocols within the family have higher secret key rate and much longer transmission distance than the one-way CV-QKD protocol for the noisy channel.

scholarly journals PERCEPTION OF COMPETITIVENESS IN THE CONTEXT OF SUSTAINABLE DEVELOPMENT: FACETS OF “SUSTAINABLE COMPETITIVENESS”

2010 ◽  
Vol 11 (2) ◽  
pp. 341-365 ◽  
Author(s):  
Audronė Balkytė ◽  
Manuela Tvaronavičienė
Keyword(s):  
Sustainable Development ◽  
Evaluation Criteria ◽  
Theoretical Models ◽  
Research Area ◽  
Social Progress ◽  
Future Research ◽  
Europe 2020 ◽  
New Strategy ◽  
The One ◽  
Research Initiatives

European Council agreed to the European Commission's proposal to launch a new strategy for jobs and growth ‐ the new European Union strategy for smart, sustainable and inclusive growth ‐ “Europe 2020”. This will lead to a new concept of the competitiveness and deeper relationship between sustainable development and competitiveness. The aim of this article is to set out the future research area of competitiveness theory taking into account the development of competitiveness concept and existing research tendencies. On the one hand, for developing the new concept of competitiveness, it is necessary to critically analyse existing studies on competitiveness. Researchers, examining the problems of competitiveness, differently approach the concept of competitiveness, suggesting different definitions, classification, factors, models of competitiveness, and evaluation criteria. Despite all the discussions on competitiveness however, no clear definition or model of competitiveness has yet been developed. On the other hand, globalization, economic dynamism and social progress, sustainability and competitiveness go hand‐in‐hand. Competitiveness should be underpinned by a broad vision for the economy and society. There is a need of research initiatives to develop the new concept of “Sustainable competitiveness” in the context of globalisation, with much of the research focusing on how sustainable development and competitiveness interact. Such additional research will lead to new theoretical models describing the relationships between international globalization, economic growth, sustainable development, wellbeing and competitiveness. Santrauka Europos Vadovu Taryba pritare Europos Komisij os pasiūlytai ekonomikos augimo ir darbo vietu kūrimo strategijai ‐ “Europa 2020” ‐ naujai Europos Sajungos strategijai del pažangaus, tvaraus ir integruoto augimo. Tai sudaro prielaidas naujai konkurencingumo sampratai ir gilesniam darnaus vystymosi ir konkurencingumo saryšiui. Šio straipsnio tikslas yra nustatyti tolesniu konkurencingumo teorijos tyrimu sriti, atsižvelgiant i konkurencingumo koncepcijos pletra ir egzistuojančias moksliniu tyrimu tendencijas. Iš vienos puses, siekiant pletoti konkurencingumo teorija, būtina kritiškai ivertinti egzistuojančias konkurencingumo studijas. Mokslininkai, nagrinedami konkurencingumo problematika, pateikia ivairias konkurencingumo koncepcijas, siūlydami skirtingus apibrežimus, klasifikacija_, veiksnius, konkurencingumo modelius ir vertinimo kriterijus. Nepaisant plačiu diskusiju, kol kas nera susitarta del aiškaus konkurencingumo apibrežimo ar visuotinai pripažistamo modelio. Iš kitos puses, globalizacija, ekonomikos dinamiškumas ir socialine pažanga, darnus vystymasis ir konkurencingumas yra tarpusavyje glaudžiai susije. Plati ekonomikos ir visuomenes vizija turetu būti konkurencingumo pagrindas. Egzistuojantis moksliniu tyrimuporeikis veda link naujos "darnaus kon‐kurencingumo” koncepcijos kūrimo iniciatyvu, ivertinant globalizacija ir daugiau demesio skiriant dar‐naus vystymosi bei konkurencingumo tarpusavio ryšiams. Tokie tolesni tyrimai padetu atrasti naujus teorinius modelius, charakterizuojančius tarptautines globalizacijos, ekonomikos augimo, darnaus vystymosi, geroves kūrimo ir konkurencingumo saryši.

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