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相关概念视频

Crown Ethers02:36

Crown Ethers

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Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether...
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Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

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This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
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Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Norton's Theorem01:14

Norton's Theorem

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Norton's theorem is a fundamental principle stating that a linear two-terminal circuit can be substituted with an equivalent circuit, which comprises a current source (ⅠN) in parallel with a resistor (RN). Here, ⅠN represents the short-circuit current flowing through the terminals, and RN stands for the input or equivalent resistance at the terminals when all independent sources are deactivated. This implies that the circuit illustrated in Figure (a) can be exchanged with the...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Alternative Sets of Equilibrium Equations01:31

Alternative Sets of Equilibrium Equations

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When analyzing the behavior of structures, engineers often rely on the concept of equilibrium. This refers to the state where all forces and moments acting on a system balance each other, resulting in no net movement or rotation. In many cases, equilibrium can be described by a set of standard equations. However, in some situations, alternative sets of equilibrium equations must be used to describe the system's behavior accurately.
One example of such a situation can be observed in a...
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相关实验视频

Updated: Jul 4, 2025

Characterization of Anisotropic Leaky Mode Modulators for Holovideo
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Published on: March 19, 2016

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(内部产品) 功能加密与可更新的加密文本.

Valerio Cini1, Sebastian Ramacher2, Daniel Slamanig3

  • 1NTT Research, Sunnyvale, CA USA.

Journal of cryptology : the journal of the International Association for Cryptologic Research
|January 26, 2024
PubMed
概括
此摘要是机器生成的。

我们推出了加密文本可更新的功能加密 (CUFE),使加密数据的动态访问控制成为可能. 这种新的方法允许使用特殊令牌安全更新加密文本,扩大功能加密功能.

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相关实验视频

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科学领域:

  • 密码学 密码学 密码学 密码学
  • 计算机科学 计算机科学
  • 信息安全 信息安全

背景情况:

  • 功能加密 (FE) 为安全的数据处理提供了强大的工具.
  • 现有的FE计划缺乏在加密文本生成后修改访问政策的能力.
  • 精细的访问控制对于动态数据管理和安全至关重要.

研究的目的:

  • 引入和定义加密文本可更新的功能加密 (CUFE).
  • 为了实现对加密数据的动态细粒度访问控制.
  • 扩大功能加密的实际应用.

主要方法:

  • 定义了一个新的原始,CUFE,在不可区分的设置中有一个安全概念.
  • 引入了功能解密密钥和密码文本的基于标签的匹配.
  • 开发了用于控制密码文本标签切换的更新令牌.
  • 提出了CUFE的通用构建,依赖于不可区分的模糊化 (iO).
  • 为内部产品功能提供了一个实际的CUFE构建,该构建基于随机Oracle模型中的LWE假设.

主要成果:

  • 成功定义和构建了CUFE,这是功能加密的一个新型变体.
  • 展示了对任意功能和标签预言的通用构造.
  • 实现了用于内部产品功能,加密文本可更新性的实用构建.
  • 解决了安全挑战,特别是更新的挑战加密文本.

结论:

  • 通过启用加密文本更新,CUFE显著增强了功能加密.
  • 拟议的结构为加密数据的动态访问控制提供了实际解决方案.
  • 这项工作使功能加密方案的景观充满了可更新功能.