最近由于偶然原因,接触了CP-ABE(Ciphertext-Policy Attribute-Based Encryption),学了一段时间,觉得挺精妙,记录并分享一下学习心得。 什么是ABE(Attribute-Based Encryption)? 一言以蔽之:这是一种可以实现精准化访问控制功能的基于公钥密码的算法。 ABE 根据访问策略嵌入实体的不同可以
Attribute-based encryption (ABE) is crucial for cloud computing security as it enables fine-grained non-interactive access control and allows efficient and secure data sharing without relying on trusted third parties. Multi-authority ABE (MABE) is an improvement to traditional single-authority ABE ...
Attribute-based Encryption(abe) allows for implementing fine-grained decentralized access control based on properties or attributes a user has. Thus, there is no need for writing detailed, user-based policies in advance. This makesabein particular interesting for implementing security mechanisms in dyna...
ABE，即基于属性加密，是实现精准化访问控制的公钥密码算法。ABE分为两类：KP-ABE适用于灵活性需求高，用户数量少的场景；CP-ABE则适用于用户数量多，追求高扩展性的场景。CP-ABE在加密文件时，根据访问策略设置属性，符合属性的用户仅需一次加密即可解密，如文件只能部门领导或组长访问，属性设为{role:...
Attribute-based encryption (ABE), as introduced by Sahai and Waters, allows for fine-grained access control on encrypted data. In its key-policy flavor (the dual ciphertext-policy scenario proceeds the other way around), the primitive enables senders to encrypt messages under a set of attributes...
Attribute-based encryption (ABE) is a new public key encryption based on users attributes. In this paper, we present a new method to realize a secure fine-grained access control to PHRs, which is based on emerging ABE primitives. In more details, PHR owners divide the PHR data in terms ...
ABE;Ciphertext-policy ABE;Key-policy ABE Definitions An attribute-based encryption scheme is a public key encryption scheme in which users’ private keys and ciphertexts are dependent upon descriptive attributes. Background The concept of attribute-based encryption (ABE) was first introduced by Sahai...
2、CP-ABE方案 CP-ABE方案包括四个基本算法。 Setup:设置算法 Encrypt:加密算法 KeyGen:密钥生成算法 Decrypt:解密算法 此外我们允许第五个算法:Delegate。 1、Setup Setup算法不接受除了隐式的安全参数外的其他输入,输出公开参数 和主密钥。 2、Encrypt
IBE: Identity-Based Encryption ABE: Attribute-Based Encryption (specifically CP-ABE) These implementations are designed for secure data handling in environments where confidentiality, identity binding, and fine-grained access control are required (e.g., eHealth systems). 📁 Repository Structure .├─...
Attribute-based encryption enables fine-grained control of encrypted data [SW05]. In a ciphertext-policy ABE (CP-ABE) scheme [GPSW06], for instance, ciphertexts are attached to access policies and keys are associated with sets of attributes. A key is able to recover the message hidden in ...