1,465 research outputs found
Group signatures and more from isogenies and lattices: generic, simple, and efficient
No full textWe construct an efficient dynamic group signature (or more generally an accountable ring signature) from isogeny and lattice assumptions. Our group signature is based on a simple generic construction that can be instantiated by cryptographically hard group actions such as the CSIDH group action or an MLWE-based group action. The signature is of size O(log N), where N is the number of users in the group. Our idea builds on the recent efficient OR-proof by Beullens, Katsumata, and Pintore (Asiacrypt'20), where we efficiently add a proof of valid ciphertext to their OR-proof and further show that the resulting non-interactive zero-knowledge proof system is online extractable. Our group signatures satisfy more ideal security properties compared to previously known constructions, while simultaneously having an attractive signature size. The signature size of our isogeny-based construction is an order of magnitude smaller than all previously known post-quantum group signatures (e.g., 6.6 KB for 64 members). In comparison, our lattice-based construction has a larger signature size (e.g., either 126 KB or 89 KB for 64 members depending on the satisfied security property). However, since the O(middot)-notation hides a very small constant factor, it remains small even for very large group sizes, say 2(20)
Group Signatures and More from Isogenies and Lattices: Generic, Simple, and Efficient
No full textWe construct an efficient dynamic group signature (or more generally an accountable ring signature) from isogeny and lattice assumptions. Our group signature is based on a simple generic construction that can be instantiated by cryptographically hard group actions such as the CSIDH group action or an MLWE-based group action. The signature is of size O(logN), where N is the number of users in the group. Our idea builds on the recent efficient OR-proof by Beullens, Katsumata, and Pintore (Asiacrypt'20), where we efficiently add a proof of valid ciphertext to their OR-proof and further show that the resulting non-interactive zero-knowledge proof system is online extractable.Our group signatures satisfy more ideal security properties compared to previously known constructions, while simultaneously having an attractive signature size. The signature size of our isogeny-based construction is an order of magnitude smaller than all previously known post-quantum group signatures (e.g., 6.6 KB for 64 members). In comparison, our lattice-based construction has a larger signature size (e.g., either 126 KB or 89 KB for 64 members depending on the satisfied security property). However, since the O(.)-notation hides a very small constant factor, it remains small even for very large group sizes, say 2(20)
Spin-orbit coupling effects on the in-plane optical anisotropy of semiconductor quantum wells
No full textInvestigation of the mode splitting induced by electro-optic birefringence in a vertical-cavity surface-emitting laser by polarized electroluminescence
No full textSex differences in the prediction of the effectiveness of paroxetine for patients with major depressive disorder identified using a receiver operating characteristic curve analysis for early response [Corrigendum]
No full textTomita T, Norio YF, Sato Y, et al. Neuropsychiatr Dis Treat. 2014;10:599–606.On page 599, there is an error in the author list "Yasui-Furukori Norio" should read "Norio Yasui-Furukori".Read the original articl
Search for missing charmonium states in B-meson decays
No full textThe recent progress in experiments at B-factories suggests an opportunity to search for the missing charmonium states eta'(c)(2(1)S(0)) and h(c)(1 P-1(1)). The feasibility of such a search in B-meson decays are discussed. (C) 2002 Elsevier Science B.V All rights reserved.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000176725100002&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Physics, MultidisciplinarySCI(E)6ARTICLE1-26-1053
The Incidence and Trends of Yellow Fever from 1990 to 2021 in Major Endemic Regions: A Systematic Analysis Based on the 2021 Global Burden of Disease Study
No full textAs a re-emerging disease, the worldwide burden and trends of yellow fever (YF) remain inadequately quantified. This study aims to assess the incidence of YF both globally and in major endemic regions from 1990 to 2021. Utilizing data from the Global Burden of Disease (GBD) database, we evaluated the burden of YF. We employed an age–period–cohort model to assess the influence of age, period, and cohort on the incidence of YF from 1992 to 2021. A secondary data analysis based on GBD database showed the following: in 2021, there were 86,509 incident cases of YF. Between 1990 and 2021, the number of incident cases decreased by 74.7%, while the age-standardized incidence rate (ASIR) declined at an EAPC of −4.76% (95% confidence interval: −5.10 to −4.42). In 2021, the highest ASIRs of YF were observed in Western Sub-Saharan Africa, Central Sub-Saharan Africa, and Eastern Sub-Saharan Africa. The analysis of age effects indicates that children aged 5–10 years old exhibit the highest incidence rate. Both period and cohort effects demonstrated a decline in morbidity risk. The decomposition analysis identified epidemiological changes as the primary factor contributing to the global reduction in the YF burden. Despite considerable reduction in incidence, YF remains a significant public health threat in Sub-Saharan Africa
Osmotic blistering in enamel bonded with one-step self-etch adhesives
No full textOne-step self-etch adhesives behave as permeable membranes after polymerization, permitting water to move through the cured adhesives. We hypothesize that osmotic blistering occurs in bonded enamel when these adhesives are used without composite coupling. Tooth surfaces from extracted human premolars were bonded with 5 one-step self-etch adhesives. They were immersed in distilled water or 4.8 M CaCl(2), and examined by stereomicroscopy, field-emission/environmental SEM, and TEM. Water blisters were observed in bonded enamel but not in bonded dentin when specimens were immersed in water. They collapsed when water was subsequently replaced with CaCl(2). Blisters were absent from enamel in specimens that were immersed in CaCl(2) only. Water trees were identified from adhesive-enamel interfaces. Osmotic blistering in enamel is probably caused by the low water permeability of enamel. This creates an osmotic gradient between the bonded enamel and the external environment, causing water sorption into the interface
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