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Aggregation‐induced emission (AIE) carbon dot (CDs) in solid state with tunable multicolor emissions have sparked significant interest in multidimensional anti‐counterfeiting. However, the realization of solid‐state fluorescence (SSF) by AIE effect and the regulation of fluorescence wavelength in solid state is a great challenge. In order to solve this dilemma, the AIE method to prepare multi‐color solid‐state CDs with fluorescence wavelengths ranging from bright blue to red emission is employed. Specifically, by using thiosalicylic acid and carbonyl hydrazine as precursors, the fluorescence wavelength can be accurately adjusted by varying the reaction temperature from 150 to 230 °C or changing the molar ratio of the precursors from 1:1 to 1:2. Structural analysis and theoretical calculations consistently indicate that increasing the sp2 domains or doping with graphite nitrogen both cause a redshift in the fluorescence wavelength of CDs in the solid state. Moreover, with the multi‐dimensional and adjustable fluorescence wavelength, the application of AIE CDs in the fields of multi‐anti‐counterfeiting encryption, ink printing, and screen printing is demonstrated. All in all, this work opens up a new way for preparing solid‐state multi‐color CDs using AIE effect, and further proposes an innovative strategy for controlling fluorescence wavelengths. Herein, they proposed an efficient and precise wavelength tuning mechanism for the Aggregation‐induced emission (AIE) carbon dots (CDs). Specifically, by using thiosalicylic acid and carbonyl hydrazine as precursors, they can accurately adjust the fluorescence wavelength by varying the reaction temperature or changing the molar ratio of the precursors. Moreover, the application of AIE CDs in the fields of multi anti‐counterfeiting encryption has been demonstrated.

Stimuli‐responsive single‐molecule multi‐emission materials have long attracted considerable attention due to their great potential in non‐phase‐separated smart luminescence. Here, a new strategy is demonstrated for manipulating electron transfer based on donor‐acceptor decoupling to regulate energy levels, aiming to achieve excitation‐dependent (Ex‐De) single‐molecule emission with switchable multiple fluorescence and phosphorescence. The synthesized 10‐phenyl‐10H,13'H‐spiro[acridine 9,6'‐pentacen]‐13'‐one (ACRSP) exhibits anti‐Kasha quadruple‐level emission and opposite Ex‐De afterglow in different environments. The high‐energy emission bands of multi‐fluorescence in solution respond to excitation, whereas in poly(methyl methacrylate) (PMMA), phosphorescence‐fluorescence multi‐emission causes Ex‐De to appear in the low‐energy emission band. Experimental and computational results indicate that exciton spin ratios and emissive state compositions vary with excitation modes, leading to dual Ex‐De behavior from three fluorescence and one phosphorescence emissions. Donor‐acceptor decoupling separates locally excited (LE) and charge transfer (CT) states, while triplet level inversion enables Ex‐De behavior and room‐temperature phosphorescence (RTP) coexistence (τ = 770.54 ms). By tuning the excitation mode of ACRSP, we achieve Ex‐De long afterglow emission from an isolated molecule, enabling time‐resolved and excitation‐responsive multi‐dimensional information encryption. This work offers design guidelines for purely organic Ex‐De systems and paves the way for next‐generation single‐molecule responsive luminophores. By manipulating the quadruple decoupled radiative transitions of donor and acceptor units, dual‐phase excitation‐dependent afterglow emission is achieved for the first time in a single isolated molecule. The decoupled donor‐acceptor units precisely manipulate the electron transfer pathways in ACRSP, endowing it with intrinsic single‐molecule Ex‐De properties, resulting in anti‐Kasha quadruple emission levels. The precise control over exciton spin ratios and excited‐state components enables time‐resolved and wavelength‐responsive multidimensional information encryption.

Traditional organic light-emitting materials hinder their anti-counterfeiting application in solid state due to their aggregation-caused quenching effect. A facile and straightforward method was reported to introduce AIE molecules into microspheres and manipulate different reaction parameters to prepare AIE microspheres with different morphologies. In this strategy, fluorescent microspheres with spherical, apple-shaped, and hemoglobin-like types were synthesized. Driven by the photocyclization and oxidation of tetraphenylethene, microspheres can be used as an aqueous fluorescence ink with erasable properties. The fluorescent patterns printed by microsphere ink on paper can be irreversibly erased by prolonged exposure to ultraviolet light (365 nm, 60 mw/cm2). Moreover, the multi-morphology microspheres can be further arranged for multiple-information encryption and anti-counterfeiting of barcodes and two-dimensional codes, in which double validation was carried out through fluorescence spectroscopy and laser confocal microscopy. This approach provides a new method for more reliable anti-counterfeiting and information encryption.

集合相似性的保密计算是安全多方计算的常见问题之一, 可用于数据匹配、信息检索、模式识别等各种应用. 本文在集合元素范围已知的情况下利用加密选择和 Paillier 密码系统的同态性, 在集合相似值是密文的基础上设计了最相似集合的保密计算协议. 然后, 利用随机数混淆实际数据, 并使用 Paillier 密码系统的同态性设计了相似性阈值集合的保密计算协议. 本文协议都是基于同态加密而不是通过构造 B+ 树实现的, 从而解决了现有大多数研究插入新数据时会导致树的结构变化且无法保护插入新数据的数量等问题. 同时, 通过模拟范例严格证明了协议的安全性. 最后, 在设计最相似集合的保密计算协议的基础上, 解决了数据库保密搜索最相似的文档问题. 与现有方案相比, 本文协议是高效的.

Public key cryptography is a major interdisciplinary subject with many real-world applications, such as digital signatures. A strong background in the mathematics underlying public key cryptography is essential for a deep understanding of the subject, and this book provides exactly that for students and researchers in mathematics, computer science and electrical engineering. Carefully written to communicate the major ideas and techniques of public key cryptography to a wide readership, this text is enlivened throughout with historical remarks and insightful perspectives on the development of the subject. Numerous examples, proofs and exercises make it suitable as a textbook for an advanced course, as well as for self-study. For more experienced researchers it serves as a convenient reference for many important topics: the Pollard algorithms, Maurer reduction, isogenies, algebraic tori, hyperelliptic curves and many more.

安全多方计算是密码学界研究的热点问题, 保密判断字符串匹配是安全多方计算的常见问题之一, 其在文本处理领域中是非常重要的一个主题. 它可以用于数据处理、数据压缩、文本编辑、信息检索等多种应用中. 现有含通配符的字符串保密匹配算法大多数只能实现近似匹配, 且通配符的使用受个数、位置的限制, 使用不灵活. 本文设计了一种新的编码方法, 应用该编码方法和Paillier加法同态加密算法, 在半诚实模型下设计了字符串模式匹配的保密判定协议和含通配符的字符串保密匹配协议, 尤其是第二个协议有一些非常理想的特征, 字符串中可以包含零、一个或多个通配符, 通配符可以位于字符串的任意位置, 一个通配符可以代表任意数量的字符. 协议可以保密地实现字符串的精确匹配, 通配符的使用也很灵活. 其次, 由于协议是基于同态加密而不是Bloom Filter构造的, 从而消除了Bloom Filter造成的误判, 实现了更高水平的隐私保护. 采用模拟范例证明了协议的安全性, 效率分析表明所设计的协议是高效的.

Going far beyond typical computer forensics books, this thoroughly revised edition of an Artech House bestseller is the only book on the market that focuses on how to protect one's privacy from data theft, hostile computer forensics, and legal action. It addresses the concerns of today's IT professionals, as well as many users of personal computers, offering more detailed \"how to\" guidance on protecting the confidentiality of data stored on computers. Moreover, the second edition has been updated to include specific information on the vulnerabilities of ancillary computing devices, such as PDAs, cellular telephones and smart cards. This cutting-edge book identifies the specific areas where sensitive and potentially incriminating data is hiding in computers and consumer electronics, and explains how to go about removing this data. The book provides a systematic process for installing operating systems and application software that will help to minimize the possibility of security compromises, and numerous specific steps that need to be taken to prevent the hostile exploitation of one's computer