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分为两种: CP-ABE:将访问策略...
A system for attribute-based encryption comprises a first encrypter (11) and a second encrypter (12). The first encrypter (11) comprises an input unit (1) for determining a message and a policy over a set of attributes, wherein the policy comprises a plurality of components, and a ...
上次提到了属性基加密的一个由来,从那之后,业界大佬继续研究,得到了一种多权威机构的属性基加密。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...
求翻译:Attribute-Based Encryption是什么意思?待解决 悬赏分:1 - 离问题结束还有 Attribute-Based Encryption问题补充:匿名 2013-05-23 12:21:38 基于属性的加密 匿名 2013-05-23 12:23:18 基于安全属性加密 匿名 2013-05-23 12:24:58 基于归因于的加密 匿名 2013-05-23 12:26:38 基于属性...
BrentWaters TheUniversityofTexasatAustin FunctionalEncryption •Functionalityf(x,y)–specifieswhatwillbelearnedaboutciphertext y x Application Whoshouldbeabletoreadmydata?accesspolicy Attribute-BasedEncryption[SW05]Ciphertexts:associatedwithaccessformulas (AÇB)ÆCSecretKeys:associatedwithattributes {A,C} De...
•ProblemStatement•Attribute-BasedEncryptionw/AuxiliaryInputs andContinualAuxiliaryInputs•OurTechniques 2 •Thecentralnotionofmoderncryptographyreliesonthesecrecyofthesecretkey.•Inpractice,thisparadigmissubjecttotheimmanentthreatofside-channelattacks.3 •Formalsecurityguaranteesevenwhenthesecret(key/...
内容提示: Ciphertext-Policy Attribute-Based EncryptionJohn BethencourtCarnegie Mellon Universitybethenco@cs.cmu.eduAmit SahaiUCLAsahai@cs.ucla.eduBrent WatersSRI Internationalbwaters@csl.sri.comAbstractIn several distributed systems a user should only be ableto access data if a user posses a certain ...
Currently, only simple form of encryption schemes, such as secret-key and public-key encryption, are constructed in this setting. In this paper, we enrich the available tools in fine-grained cryptography by proposing the first fine-grained secure attribute-based encryption (ABE) scheme. Our ...
However, the predicate encryption systems realized thus far tend to be much less expressive than access control systems that leave the access structures in the clear. Other examples of encryption systems with more “structure” added include Hierarchical Identity- Based Encryption [29, 26] and Wild...
In key-policy attribute based encryption, ciphertexts are associated with sets of descriptive at- tributes, and users’ keys are associated with policies (the reverse of our situation). We stress that in key- policy ABE, the encryptor exerts no control over who has access to the data she ...