Multilevel Threshold Secret and Function Sharing based on the Chinese Remainder Theorem

A recent work of Harn and Fuyou presents the first multilevel (disjunctive) threshold secret sharing scheme based on the Chinese Remainder Theorem. In this work, we first show that the proposed method is not secure and also fails to work with a certain natural setting of the threshold values on compartments. We then propose a secure scheme that works for all threshold settings. In this scheme, we employ a refined version of Asmuth-Bloom secret sharing with a special and generic Asmuth-Bloom sequence called the {\it anchor sequence}. Based on this idea, we also propose the first multilevel conjunctive threshold secret sharing scheme based on the Chinese Remainder Theorem. Lastly, we discuss how the proposed schemes can be used for multilevel threshold function sharing by employing it in a threshold RSA cryptosystem as an example

BlindHub: Bitcoin-Compatible Privacy-Preserving Payment Channel Hubs Supporting Variable Amounts

Payment Channel Hub (PCH) is a promising solution to the scalability issue of first-generation blockchains or cryptocurrencies such as Bitcoin. It supports off-chain payments between a sender and a receiver through an intermediary (called the tumbler). Relationship anonymity and value privacy are desirable features of privacy-preserving PCHs, which prevent the tumbler from identifying the sender and receiver pairs as well as the payment amounts. To our knowledge, all existing Bitcoin-compatible PCH constructions that guarantee relationship anonymity allow only a (predefined) fixed payment amount. Thus, to achieve payments with different amounts, they would require either multiple PCH systems or running one PCH system multiple times. Neither of these solutions would be deemed practical. In this paper, we propose the first Bitcoin-compatible PCH that achieves relationship anonymity and supports variable amounts for payment. To achieve this, we have several layers of technical constructions, each of which could be of independent interest to the community. First, we propose $\textit{BlindChannel}$, a novel bi-directional payment channel protocol for privacy-preserving payments, where {one of the channel parties} is unable to see the channel balances. Then, we further propose $\textit{BlindHub}$, a three-party (sender, tumbler, receiver) protocol for private conditional payments, where the tumbler pays to the receiver only if the sender pays to the tumbler. The appealing additional feature of BlindHub is that the tumbler cannot link the sender and the receiver while supporting a variable payment amount. To construct BlindHub, we also introduce two new cryptographic primitives as building blocks, namely $\textit{Blind Adaptor Signature}$(BAS), and $\textit{Flexible Blind Conditional Signature}$. BAS is an adaptor signature protocol built on top of a blind signature scheme. Flexible Blind Conditional Signature is a new cryptographic notion enabling us to provide an atomic and privacy-preserving PCH. Lastly, we instantiate both BlindChannel and BlindHub protocols and present implementation results to show their practicality

Characteristics of food allergy in children: National multicenter study

Conference: Congress of the European-Academy-of-Allergy-and-Clinical-Immunology (EAACI) Location: Lisbon, PORTUGAL Date: JUN 01-05, 2019Background : Food allergies impose a significant burden on the life of the child and the family. In this study, to determine the demographic characteristics of food allergies, we investigated the characteristics of patients with food allergies in different regions of Pediatric Allergy- Immunology departments in Turkey. Method : Turkey ' s National Study of Allergy and Clinical Immunology Society has conducted a Study Group on Food Allergies. 25 centers participated in this multicenter, cross- sectional and descriptive study.European Academy of Allergy and Clinical Immunolog

The use of block chain in public administration: Sample D5

Çalışmanın amacı blokzincir teknolojisinin kamu yönetimine etkisini araştırmaktır. Bu amacın gerçekleşebilmesi için blokzincir teknolojisinin kamu hizmetlerine, mevcut ve potansiyel etkileri ortaya konulmaktadır. Çalışma kısaca D5 (Dijital 5 Ulusları) adı verilen Birleşik Krallık, Estonya, Güney Kore, Yeni Zelanda ve İsrail ülke örnekleriyle sınırlıdır. Çalışmanın yöntemi içerik analizidir. Konuyla ilgili kişi ve kurumların yayınları, kurumsal ve erişime açık dokümanlarının içeriği incelenip, analiz edilmiştir. Bulgulara göre, devletin temel işlevleri açısından bakıldığında blokzincir teknolojisinin, iç ve dış güvenliği, adaleti sağlama işlevlerini yerine getirmede kullanılmaya başlandığı görülmektedir. Temel haklar ekseninde değerlendirildiğinde ise kamu otoriteleri tarafından blokzincir teknolojisinin, yaşama hakkı, sağlık hakkı, özel yaşamın gizliliği hakkı ve ekonomik haklar bağlamında çözümler üretmeyi sağlayan bir araç olabileceği değerlendirilmektedir. Kamu hizmetleri yönüyle değerlendirildiğinde blokzincir teknolojisinin, sosyal yardımların dağıtımına, pasaport almaya-vermeye, tapu sicil işlemlerini gerçekleştirebilmeye, devlet ve paydaşları arasındaki tedarik zinciri süreçlerini iyileştirmeye olanak sağladığı sonucunu ulaşılmaktadır. Sonuç olarak D5 üyesi ülkelerde, özellikle kamu hizmetlerinin vatandaşlara sunumunda blokzincir teknolojisinin kullanılması suretiyle blokzincir teknolojisi ile kamu yönetimi arasında etkileşimin başladığı görülmektedir.The aim of the study is to research the effect of blockchain technology on public administration. In order to achieve this goal, current and potential effects of blockchain technology on public services are revealed. The study is briefly limited to the UK, Estonia, South Korea, New Zealand and Israel country examples called D5 (Digital 5 Nations). The method of the study is content analysis. The publications of the relevant people and institutions, the content of their institutional and accessible documents were researched and analyzed. According to the findings, when evaluated in terms of the basic functions of the state, it is seen that blockchain technology has begun to be used in fulfilling the functions of providing internal and external security and justice. When it is evaluated in terms of fundamental rights, it is considered by public authorities that blockchain technology can be a tool that provides solutions in the context of the right to life, the right to health, the right to privacy and economic rights. When evaluated in terms of public services, it is concluded that blockchain technology enables distribution of social benefits, import or export passports, performing land registry transactions, and improving supply chain processes between the state and its stakeholders. As a result, It seems that the interaction between blockchain technology and public administration has begun in D5 member countries, especially with the use of blockchain technology in the provision of public services to citizens

The use of block chaın ın publıc admınıstratıon: sample d5

Çalışmanın amacı blokzincir teknolojisinin kamu yönetimine etkisini araştırmaktır. Bu amacın gerçekleşebilmesi için blokzincir teknolojisinin kamu hizmetlerine, mevcut ve potansiyel etkileri ortaya konulmaktadır. Çalışma kısaca D5 (Dijital 5 Ulusları) adı verilen Birleşik Krallık, Estonya, Güney Kore, Yeni Zelanda ve İsrail ülke örnekleriyle sınırlıdır. Çalışmanın yöntemi içerik analizidir. Konuyla ilgili kişi ve kurumların yayınları, kurumsal ve erişime açık dokümanlarının içeriği incelenip, analiz edilmiştir. Bulgulara göre, devletin temel işlevleri açısından bakıldığında blokzincir teknolojisinin, iç ve dış güvenliği, adaleti sağlama işlevlerini yerine getirmede kullanılmaya başlandığı görülmektedir. Temel haklar ekseninde değerlendirildiğinde ise kamu otoriteleri tarafından blokzincir teknolojisinin, yaşama hakkı, sağlık hakkı, özel yaşamın gizliliği hakkı ve ekonomik haklar bağlamında çözümler üretmeyi sağlayan bir araç olabileceği değerlendirilmektedir. Kamu hizmetleri yönüyle değerlendirildiğinde blokzincir teknolojisinin, sosyal yardımların dağıtımına, pasaport almaya-vermeye, tapu sicil işlemlerini gerçekleştirebilmeye, devlet ve paydaşları arasındaki tedarik zinciri süreçlerini iyileştirmeye olanak sağladığı sonucunu ulaşılmaktadır. Sonuç olarak D5 üyesi ülkelerde, özellikle kamu hizmetlerinin vatandaşlara sunumunda blokzincir teknolojisinin kullanılması suretiyle blokzincir teknolojisi ile kamu yönetimi arasında etkileşimin başladığı görülmektedir.The aim of the study is to research the effect of blockchain technology on public administration. In order to achieve this goal, current and potential effects of blockchain technology on public services are revealed. The study is briefly limited to the UK, Estonia, South Korea, New Zealand and Israel country examples called D5 (Digital 5 Nations). The method of the study is content analysis. The publications of the relevant people and institutions, the content of their institutional and accessible documents were researched and analyzed. According to the findings, when evaluated in terms of the basic functions of the state, it is seen that blockchain technology has begun to be used in fulfilling the functions of providing internal and external security and justice. When it is evaluated in terms of fundamental rights, it is considered by public authorities that blockchain technology can be a tool that provides solutions in the context of the right to life, the right to health, the right to privacy and economic rights. When evaluated in terms of public services, it is concluded that blockchain technology enables distribution of social benefits, import or export passports, performing land registry transactions, and improving supply chain processes between the state and its stakeholders. As a result, It seems that the interaction between blockchain technology and public administration has begun in D5 member countries, especially with the use of blockchain technology in the provision of public services to citizens

Effects of different strength training methods on dynamic balance in basketball players

You should leave 8 mm of space above the abstract and 10 mm after the abstract. The heading Abstract should be typed in bold 9-point Arial. The body of the abstract should be typed in normal 9-point Times in a single paragraph, immediately following the heading. The text should be set to 1 line spacing. The abstract should be centred across the page, indented 17 mm from the left and right page margins and justified

Studying hand grip strength development among students who have taken tennis and massage courses

In this study, the finger and hand force developments of the students who have taken selective/applied Tennis and Massage courses at the University have been examined. From the students of the Department of Physical Education and Sport, 19 healthy females and 73 healthy males (age = 21.25 ± 1.55 years (average ± SD) who have taken selective Tennis courses;51 healthy males (age = 22.00 ± 1.04 years (average ± SD) who have taken Massage courses; and as the control group,16 healthy womenand50 healthy males(age = 21.72 ± 1.47 years (average ± SD) have been participated to the study. The age, length, body weight, grip strength of both hands as well as the finger grip strength of the subjects have been recorded. The course schedule has been set as once a week four hours practice for both tennis and massage. Two weeks of the education and training program that takes twelve weeks in total were assigned for theoretical classes. The remaining period of ten weeks was for practice classes and the measurements were performed before and after this ten weeks period. The hand grip strength measurement has been carried out with a Takkei branded hand dynamometer whereas for the measurement of the finger grip strength, a Baseline branded pinch meter has been used. For both the pre-test and final test of the finger grip and hand grip strength measurements, the paired sample t test has been used in terms of in-group comparisons, whereas for the inter-group comparisons, one-way ANOVA has been used. For the significant F values, post hoc Tukey test has been used. The right hand and the left hand grip values of both test groups as well as the values of the control group have been significantly increased between the pre-test and final test. Particularly, preferring the exercises that improve the hand and finger grip strengths would enable a better racket handle grip as well as an improved shot efficiency for tennis. This would also enable masseurs/masseuses to apply an efficient massage therapy with higher pressure

Pilastip Show’un tarihi ve Türk siyasetindeki yeri

Ankara : İhsan Doğramacı Bilkent Üniversitesi İktisadi, İdari ve Sosyal Bilimler Fakültesi, Tarih Bölümü, 2016.This work is a student project of the The Department of History, Faculty of Economics, Administrative and Social Sciences, İhsan Doğramacı Bilkent University.by Öztürk, İbrahim Mert