User collusion avoidance scheme for privacypreserving. Efficient attributebased encryption with privacypreserving. In such a system, the decryption of a ciphertext is possible only if the set of attributes of the user key matches the attributes of the ciphertext. Privacypreserving decentralized keypolicy attribute. Assume that there are faculty members and administrative staff in a faculty of computer science. In this system, patients can encrypt their phrs and store them on semitrusted cloud servers such that servers do not have access to sensitive phr contexts. Using the idea of boolean equivalent transformation, the proposed scheme achieves fast encryption and privacy protection for both data owner and legitimate visitors. Mar 01, 2018 decentralized attributebased encryption abe is an efficient and flexible multiauthority attributebased encryption system, since it does not requires the central authority and does not need to cooperate among the authorities for creating public parameters. In this paper, we propose a privacypreserving decentralized keypolicy abe scheme where each authority can issue secret keys to a user independently without knowing anything about his gid.
Therefore, constructing a decentralized abe scheme with privacypreserving remains a challenging research problem. All these work use a cryptographic primitive known as attribute based encryption abe. In order to protect privacy of the user, han et al. Collusion attack on decentralized keypolicy attributebased encryption scheme. Key policy attributebased encryption kpabe and ciphertext policy attributebased encryption cpabe. Various attribute based encryption algorithms in cloudsa survey.
An efficient privacypreserving attributebased encryption. One is keypolicy attributebased encryption kpabe and the other is ciphertextpolicy attributebased encryption cpabe. Both users secrete key and ciphertext are labelled with set of attributes the basic concept of abe is to construct a fuzzy identity base encryption ibe scheme 8910 basically there are two kind of attribute based encryption scheme as give below. We were first motivated by the fullblown keypolicy attributebased encryption scheme kpabe and its application example proposed by vipul goyal et al. Cloudbased finegrained health information access control framework for lightweight iot devices. In previous privacy preserving multiauthority attribute based encryption ppmaabe schemes, a user can acquire secret keys from multiple authorities with. Yan, privacypreserving decentralized keypolicy attributebased encryption, ieee transactions on parallel and distributed. Keypolicy attributebased encryption kpabe 24 and ciphertextpolicy attributebased encryption cpabe 25. In the proposed scheme, each authority can join or leave the system randomly without reinitializing the system,and issue secretpublic keys to user.
Index terms decentralized attributebased encryption, key policy, collusion attack, dbdh assumption. Encryption function is modeled as sender decides the access tree through boolean access structure. Attributebased encryption is a type of publickey encryption in which the secret key of a user and the ciphertext are dependent upon attributes e. Attributebased encryption an overview sciencedirect. A novel privacypreserving decentralized ciphertextpolicy. Protecting user privacy by using decentralized keypolicy.
In an abe system, each user has a unique id and a set of attributes. The cloud server might tamper or replace the data owners original ciphertext for malicious attacks, and. Cipher policy attribute based encryption cpabe is a more efficient and. In general, abe can be divided into two categories. Privacypreserving decentralized keypolicy attributebased. Pdf privacypreserving decentralized keypolicy attribute. Decryption process decryption function takes cipher text, group. Privacypreserving decentralized cipherpolicy attributebased.
Improving security and privacypreserving in multiauthorities. In this paper, we propose a user collusion avoidance scheme which preserves the users privacy when they interact with multiple authorities to obtain decryption credentials. Meanwhile patients maintain full control over access to. In this paper, we propose a privacypreserving decentralized keypolicy abe scheme where each authority can issue secret keys to a user independently without. Privacypreserving multiauthority attributebased encryption. A threshold gate with threshold k returns a value true only if at least k of its child nodes evaluates to true. Ibe is also a useful building block in various cryptographic primitives. Attributebased encryption abe, as a useful data encryption tool to address the problem of. Improving privacy and security in decentralized ciphertextpolicy. Improving privacypreserving and security for decentralized. A privacypreserving decentralized ciphertextpolicy attributebased encryption cpabe scheme is a variant of the multiauthority attributebased encryption schemes where it requires neither a central authority nor cooperation among authorities for issuing secret keys.
Decentralized attributebased encryption abe is a variant of a multiauthority abe scheme where each authority can issue secret keys to the user independently without any cooperation and a central authority. New privacypreserving architectures for identityattribute. Privacypreserving decentralized key policy attributebased. To solve these problems, this paper proposes an efficient privacypreserving attributebased encryption scheme with hidden policy for outsourced data. In this paper, a novel decentralized keypolicy attributebased signcryption abs scheme is proposed, where each authority can generate secretpublic key pair for the user independently without any cooperation and a centralized authority. Attribute based encryption with privacy preserving and. Sep 01, 2019 note that keypolicy attributebased encryption kpabe is the dual of cpabe with ciphertext associated with attributes and key with access policy. Mar 21, 2014 sahai and waters 1 gave a solution to this issue by presenting attribute. Privacypreserving decentralized keypolicy attributebased encryption abstract. A ciphertextpolicy attributebased proxy reencryption with. Decentralized attributebased encryption abe is a variant of a multiauthority abe scheme where each authority can issue secret keys to the. Improving privacypreserving and security for decentralized key. Essentially, the scheme in further develops the first attributebased encryption scheme by allowing for a wide variety of access structures, not only a fixed threshold gate.
Achieving an effective, scalable and privacypreserving. Decentralized ciphertextpolicy attributebased encryption. Achieving an effective, scalable and privacypreserving data. Decentralized privacy preserving modified macpaber. Efficient attributebased encryption with privacypreserving key generation and. They are keypolicy abe kpabe scheme and ciphertextpolicy abe cpabe scheme.
Security analysis of a privacypreserving decentralized keypolicy. Attributebased encryption is a public key based encryption that enables access control over encrypted data using access policies and ascribed attributes. Doc attribute based encryption with privacy preserving data. Privacy preserving based logistic regression on big data. Circuit ciphertextpolicy attributebased hybrid encryption. Privacy preserving through mediator in decentralized ciphertext policy attribute based encryption varsha thanaji mulik1, shinu acca mani2, saritha k3, suraj u rasal4 1 m.
Efficient attributebased encryption with privacypreserving key. Cipher policy attribute based encryption cpabe is a more efficient and flexible encryption. After these schemes, a decentralized attribute based access control with privacy preserving is addressed to provide the great secure sharing of sensitive data with multiple users. One of the encryption schemes is attributebased encryption abe which is a new paradigm where such policies are specified and cryptographically enforced in the encryption algorithm itself. Attributebased encryption and privacypreserving data sharing. In abe, a user has a set of attributes in addition to its unique id. This kind of new cryptographic technology enables users to achieve access control over encrypted data. The example discussed above is that of a cpabe where the policy is associated with the dataciphertext, and each user has attributes associated with them. Message privacy with load balancing using attribute based.
Pdf privacy preserving using kpabe technique in cloud. A keypolicy searchable attributebased encryption scheme. Jan 31, 2012 privacypreserving decentralized keypolicy attributebased encryption abstract. Attribute based encryption with privacy preserving and user. A privacypreserving decentralized ciphertextpolicy attributebased encryption cpabe scheme is a variant of the multiauthority attributebased encryption schemes where it requires neither a. User collusion avoidance scheme for privacypreserving decentralized keypolicy attributebased encryption. Chapter 2 overview of attibute based encryption brief description of proposed systemwe proposed a privacypreserving decentralized key distribution centerkdc scheme to protect the users privacy. Hence, existing ppmaabe schemes cannot fully protect users.
User collusion avoidance scheme for privacypreserving decentralized keypolicy attributebased encryption by yogachandran rahulamathavan, suresh veluru, jinguang han, fei li, muttukrishnan rajarajan and rongxing lu. In decentralized key policy abe, without the cooperation of a central authority the individual authorities can issue the secret key to user independently 15. In this paper, we propose a privacy preserving decentralized cpabe. Only those enterprises whose attributes meet the access policy can decrypt. Dec 16, 2015 we present an efficient decentralized attributebased encryption abe that supports any monotone access structure mas with faster decryption capability in the keypolicy setting. The scheme preserves the user privacy when users interact with multiple authorities to obtain decryption keys while mitigating the wellknown user collusion security vulnerability. Attributebased encryption for cloud computing access control. Improving privacy and security in decentralized ciphertextpolicy attributebased encryption abstract in previous privacypreserving multiauthority attributebased encryption ppmaabe schemes, a user can acquire secret keys from multiple authorities with them knowing hisher attributes and furthermore, a central authority is required. Abstract the notion of identitybased encryption ibe was proposed as an economical alternative to publickey infrastructures. Access matrix compares the attributes for similarity. In this paper, we propose a privacypreserving decentralized cpabe ppdcpabe scheme where the central authority is not required, namely each authority can.
Decentralized privacy preserving modified macpaber scheme. Decentralized keypolicy attributebased encryption yogachandran rahulamathavan, suresh veluru, jinguang han, fei li, muttukrishnan rajarajan, and rongxing lu abstract decentralized attributebased encryption abe is a. Privacypreserving and efficient public key encryption with. Decentralized key policy abe scheme is to protect the users privacy using which each authority can issue secrete key to users separately without having any idea of his gid. In such a system, the decryption of a ciphertext is possible only if the set of attributes of the user key matches the. User collusion avoidance scheme for privacypreserving decentralized keypolicy attributebased encryption y rahulamathavan, s veluru, j han, f li, m rajarajan, r lu ieee transactions on computers 65 9, 29392946, 2015. An efficient tate pairing algorithm for a decentralized keypolicy attribute based encryption scheme in cloud environments. This is in contrast to the previous constructions, where multiple authorities must be online and setup the system interactively, which is impractical. In this paper, we propose a privacypreserving decentralized key. We present an efficient decentralized attributebased encryption abe that supports any monotone access structure mas with faster decryption capability in the keypolicy setting.
Doc attribute based encryption with privacy preserving. Decentralized attribute based encryption abe is a variant of a multiauthority abe scheme where each authority can issue secret keys to the. In proceedings of the european symposium on research in. Request pdf privacy preserving decentralized key policy attribute based encryption decentralized attribute based encryption abe is a. Introduced by sahai and waters 25, attributebased encryption abe, which is a generalization of identitybased encryption ibe, is able to e ectively increase the exibility of data sharing such that only parties satisfying speci c policy are allowed to access the data.
Decentralized attributebased encryption abe is a variant of multiauthority based abe whereby any attribute authority aa can independently join and leave the system without collaborating with the existing aas. A ciphertextpolicy attributebased proxy reencryption. Attributebased encryption abe introduced by sahai and waters 4 is a more proficient encryption scheme and it can. In kpabe scheme, the ciphertext is associated with a set of descriptive attributes. In this paper, we are going to analyze various schemes for encryption and possible solutions for their limitations that consist of attribute based encryption abe, cpabe, habe, maabe, kpabe. Privacypreserving personal health record system using. Notably, a users identity information can be extracted from hisher some sensitive attributes.
Privacy preserving through mediator in decentralized. In our scheme, all the users secret keys are tied to his identifier to resist the collusion attacks while the multiple authorities cannot know. An access control policy on attributebased encryption contains several threshold gates connected to form a tree as shown in fig. Privacypreserving and efficient public key encryption.
Verifiable outsourced decryption of attributebased. There are two variants of attributebased encryption, namely keypolicy attributebased encryption kpabe and ciphertextpolicy attributebased encryption cpabe. In the proposed abe system, the ciphertext is labeled with a set of attributes, a central authority ca issues the private keys to each user corresponding to his or her attributes. We further extend our mas construction to nonmonotone access structure nonmas in order to support negative attributes. Using the idea of boolean equivalent transformation, the proposed scheme achieves fast encryption and privacy protection for. Unfortunately, recent works show that the reality of the privacy preserving and security in almost wellknown decentralized key policy. Meanwhile, a user can obtain secret keys from multiple authorities without releasing his global identifier gid and attributes to them. Feb 03, 2016 in this paper, we propose a privacypreserving decentralized keypolicy attributebased encryption scheme. In previous privacypreserving multiauthority attributebased encryption ppmaabe schemes, a user can acquire secret keys from multiple authorities with them knowing hisher attributes and furthermore, a central authority is required. Decentralized attributebased encryption technique is a variant of multiple authority based attributebased encryption whereby any attribute authority can independently join and leave the system without collaborating with the existing attribute authorities. Privacypreserving decentralized ciphertextpolicy attributebased encryption. In this thesis, we propose a privacypreserving phr system using attributebased encryption abe. Sahai and waters is a more systematic encryption scheme and it can express a complex access structure.
1649 1230 787 1517 266 732 129 1392 893 1228 861 372 1811 147 1654 1241 891 1187 408 1322 198 686 1043 138 143 554 436 840 165 1315 669 1409 1774 1094 1703 905 945 1199