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 ...
属性加密泄露的辅助输入Attribute-basedEncryptionResilienttoAux •ProblemStatement•Attribute-BasedEncryptionw/AuxiliaryInputs andContinualAuxiliaryInputs•OurTechniques 2 •Thecentralnotionofmoderncryptographyreliesonthesecrecyofthesecretkey.•Inpractice,thisparadigmissubjecttotheimmanentthreatofside-channel...
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...
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 ...
acommunal areas 共同区域[translate] a沉稳,专注 calm, focus;[translate] a首先,我每天早上要背十个单词。积累单词! First, I every day early morning must carry ten words.Accumulation word![translate] aAttribute-Based Encryption 基于归因于的加密[translate]...
KatsuyukiTakashima MitsubishiElectric BrentWaters TheUniversityofTexasatAustin FunctionalEncryption •Functionalityf(x,y)–specifieswhatwillbelearnedaboutciphertext y x Application Whoshouldbeabletoreadmydata?accesspolicy Attribute-BasedEncryption[SW05]Ciphertexts:associatedwithaccessformulas (AÇB)ÆCSecretKeys...
Attribute-Based Encryption. By using our techniques encrypted data can be kept confidential even if the stor- age server is untrusted; moreover, our methods are secure against collusion attacks. Previous Attribute- Based Encryption systems used attributes to describe the encrypted data and built ...
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 construction is adaptively secure under the widely accepted worst-case assumption, NC1⊊⊕L/poly, and it is presented in a generic ...
We present two fully secure functional encryption schemes: a fully secure attribute-based encryption (ABE) scheme and a fully secure (attribute-hiding) predicate encryption (PE) scheme for inner-product predicates. In both cases, previous constructions were only proven to be selectively secure. Both...