The attribute-based encryption (ABE) schemes are excellent for multi-user data-sharing scenarios in which the identity of the data users is unknown in advance. ABE employs an access structure based on attributes in either the ciphertext or the secret key, and it is able to provide fine-...
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分为两种: CP-ABE:将访问策略嵌入密文 KP-ABE:将访问策略嵌入密钥 KP-ABE机制更适用于用户数量较少、但需要高度灵活性的场景;而CP-ABE机制则更适用于用户数量较多...
A second phase can then rapidly assemble an ABE ciphertext or key when the specifics become known. This concept is sometimes called "online/offline" encryption when only the message is unknown during the preparation phase; we note that the addition of unknown attribute lists and access policies...
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 ...
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...
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 ...
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...
本文的主要内容基于顶会论文TCC 2007年的文章:Multi-authority Attribute Based Encryption Sahai和Waters描述过一个方案(称为SW),在这个方案中,发送方指定一个属性集和一个数字d对消息进行加密,这样当至少拥有d个给定属性的接收方才能解密该消息。比如个人武汉市参保记录,武汉市居住证,武汉某所高校学生证等等属性。
y x Application Whoshouldbeabletoreadmydata?accesspolicy Attribute-BasedEncryption[SW05]Ciphertexts:associatedwithaccessformulas (AÇB)ÆCSecretKeys:associatedwithattributes {A,C} Decryption:{A,C} {A,C}satisfies(AÇB)ÆC (AÇB)ÆC Message ABEExample OR AND AND MedicalCompanyXresearcher ...
To achieve fine grained and scalable data access control for medical records stored in semi trusted servers, we leverage attribute based encryption (ABE) techniques to encrypt each patients medical record file. In this paper, we describe a new approach which enables secure storage and controlled ...