Hence, existing ppmaabe schemes cannot fully protect users. One is keypolicy attributebased encryption kpabe and the other is ciphertextpolicy attributebased encryption cpabe. In this paper, we propose a privacypreserving decentralized cpabe ppdcpabe scheme where the central authority is not required. Our scheme supports multiauthority scenario, in which the. Modified ciphertextpolicy attributebased encryption. Privacypreserving multiauthority attributebased encryption. In this paper, we construct a decentralized ciphertextpolicy attributebased encryption dcpabe scheme. In this paper, we propose a privacypreserving decentralized keypolicy attributebased encryption scheme. A decentralized multiauthority ciphertextpolicy attribute. A novel privacypreserving decentralized ciphertextpolicy. Attribute based encryption with key cloning protection m.
To achieve this, encryption schemes can be employed to protect the con. 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. We present an efficient decentralized attribute based encryption abe that supports any monotone access structure mas with faster decryption capability in the key policy setting. Cipherpolicy attributebased encryption cpabe is a more efficient and.
Privacypreserving decentralized ciphertextpolicy attribute. In order to share data according to a policy without prior knowledge of who will be receiving them, sahai and waters extended identity based encryption ibe 1 3 and introduced the attribute based encryption mechanism 4. Ekmi uses a new decentralized key policy attribute based encryption dkpabe with user revocation in private domain and multi authority cipher text policy attribute based encryption macpabe with attribute revocation in public domain. The scheme preserves the user privacy when users interact with.
The authors take a centralized approach where a single key distribution center kdc distributes secret keys and attributes to all users. Protecting user privacy by using decentralized keypolicy. By using the cloud technology, enterprises can handover the task of heavy data management to reliable hands and focus on their main business. In this paper, we propose a privacy preserving decentralized key policy attribute based. The motivation of this paper is on achieving user privacy during the interaction with attribute authorities by improving the. Cipherpolicy attributebased encryptioncpabe isa more e. Accountable privacy preserving attribute based framework for. In this thesis, we propose a privacy preserving phr system using attribute based encryption abe. Privacypreserving decentralized key policy attribute. In this paper, we propose a privacypreserving decentralized key. Decentralized policyhiding abe with receiver privacy. Cloudbased finegrained health information access control framework for lightweight iot devices. Multiauthority attributebased encryption abe scheme can support the.
Improving privacy and security in decentralized ciphertext. In keypolicy attribute based encryption, ciphertexts are associated with sets of descriptive attributes, and users keys are associated with policies the reverse of our situation. These variants are ciphertext policy attribute based encryption cpabe and key policy attributebased encryption kpabe. This scheme eliminates the heavy communication cost. Ekmi uses a new decentralized key policy attribute based encryption dkpabe with user revocation in private domain and multi. In this paper, we present inspabac, an accountable privacy preserving attribute based framework, for an authenticated encrypted access to data outsourced to cloud servers. Jinguang han, student member, ieee, willy susilo, senior member, ieee. Feb 03, 2016 the data confidentiality in a distributed environment can be achieved by using attribute based encryption technique. Survey on revocation in ciphertextpolicy attributebased. Privacy preserving through mediator in decentralized ciphertext policy attribute based encryption varsha thanaji mulik1, shinu acca mani2, saritha k3, suraj u rasal4 1 m. Since the introduction of attributebased encryption, several works 8, 30, 43, 29, 23, 53, 21, 22, 37 have proposed di erent abe systems and applications.
Security analysis of 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. In this paper, we propose a privacy preserving decentralized cpabe. Feb 03, 2016 in this paper, we propose a privacy preserving decentralized key policy attribute based encryption scheme.
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. Where all messages are created with their attributes and some policies designed by same attributes and stores encrypted messages to data store. In the proposed scheme, each authority can join or leave the system randomly without reinitializing the system,and issue secretpublic keys to user. Decentralized attribute based encryption, key policy, collusion attack, dbdh assumption. One of the encryption schemes is attribute based encryption abe which is a new paradigm where such policies are specified and cryptographically enforced in the encryption algorithm itself. In this paper, we propose a user collusion avoidance scheme which preserves the users privacy when they interact with. The cloud server might tamper or replace the data owners original ciphertext for malicious attacks, and. Ltd we are ready to provide guidance to successfully complete your projects and also download the abstract, base paper from our web. In this paper, we propose a privacypreserving decentralized keypolicy abe scheme where each authority can issue secret keys to a user independently without. Confidentialitypreserving based on attribute encryption. In this paper, we propose a privacypreserving decentralized keypolicy abe scheme where each. In previous privacypreserving multiauthority attributebased encryption ppma abe schemes, a user can acquire secret keys from multiple authorities with.
Attributebased encryption with key cloning protection. To make multiauthority abe schemes collusionresistant, a user in the system must be tied with a globally verifiable identifier gid. Cipher policy attribute based encryption cpabe is a more efficient and flexible encryption system as the encryptor can control the access structure when encrypting a message. We present an efficient decentralized attributebased encryption abe that supports any monotone access structure mas with faster decryption capability in the keypolicy setting.
In this paper, we propose a privacy preserving decentralized key policy abe scheme where each authority can issue secret keys to a user independently without knowing anything about his gid. User collusion avoidance scheme for privacypreserving. Decentralized attribute based encryption technique is a variant of multiple authority based attribute based encryption whereby any attribute authority can independently join and leave the system without collaborating with the existing attribute authorities. In this paper, a novel decentralized key policy attribute based signcryption abs scheme is proposed, where each authority can generate secretpublic key pair for the user independently without any cooperation and a centralized authority. Decentralized attribute based 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. In order to share data according to a policy without prior knowledge of who will be receiving them, sahai and waters extended identitybased encryption ibe 1 3 and introduced the attributebased encryption mechanism 4.
Managing and using industrial big data is a big challenge for every industrial enterprise manager. Decentralized attribute based encryption technique is a variant of multiple. Privacy preserving decentralized key policy attribute. Twoparty attributebased key agreement protocol with. In almost all abe proposals, private keys were issued by one central authority that would need to be in a position to verify all the attributes or credentials it issued for each user in the. Attributebased encryption with verifiable delegation is decryption scheme to reduced the computation cost during decryption. Therefore, constructing a decentralized abe scheme with privacypreserving remains a challenging research problem. In the han, et al scheme, the first privacy preserving decentralized kpabe encryption algorithm is proposed. Privacypreserving decentralized keypolicy attribute. European symposium on research in computer security, computer securityesorics 2014. Here multiple authorities need not be online always. There are two variants of abe ciphertext policy attribute based encryption cpabe2 and key policy attribute based encryption kp. Pdf privacypreserving decentralized keypolicy attribute. Attribute based encryption with privacy preserving and.
Privacypreserving attribute based searchable encryption. They are key policy abe kpabe scheme and ciphertext policy abe cpabe scheme. Attribute based encryption with privacy preserving in clouds. We stress that in keypolicy abe, the encryptor exerts no control over who has. In abka protocols, attribute based encryption abe plays important role in protecting secret messages used to generate session keys. We present an efficient decentralized attributebased encryption abe that supports any monotone access structure mas with faster. A privacy preserving decentralized ciphertext policy attribute based encryption cpabe scheme is a variant of the multiauthority attribute based encryption schemes where it requires neither a. Privacypreserving decentralized ciphertextpolicy attributebased encryption cipherpolicy attributebased encryption cpabe is a more. 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. Currently, abe schemes can be classified as two types.
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. 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. The major difference between them lies in how to associate a secret key and an access policy with relevant data and attributes. Notably, a users identity information can be extracted from hisher some sensitive attributes. An efficient tate pairing algorithm for a decentralized key. In an open communication environment, such as the internet, sensitive data must be encrypted prior to being transmitted. Therefore, constructing a decentralized abe scheme with privacy preserving remains a challenging research problem. Decentralized attribute based encryption abe is an efficient and flexible multiauthority attribute based encryption system, since it does not requires the central authority and does not need to.
Abe was mainly divided into two categories called ciphertext policy abe cpabe and key policy abe kpabe. Next, the decentralized key policy attribute based encryption introduced by han et al. Shahandashti3 1 icore information security lab, dept of cs, university of calgary, calgary, canada. Message privacy with load balancing using attribute based. User collusion avoidance scheme for privacypreserving decentralized keypolicy attributebased encryption.
A new decentralized access control scheme for secure data storage in clouds that supports anonymous authentication. 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. In this paper, we propose a privacypreserving decentralized cpabe ppdcpabe scheme where the central authority is not required, namely each authority can. Therefore, even if multiple authorities are corrupted, they cannot collect the users attributes by. Oapa decentralized attribute based encryption abe is an efficient and flexible multiauthority attribute based encryption system, since it does not requires the central authority and does not need to cooperate among the authorities for creating public parameters. For storage system with specific personal health record phr, we propose a modified ciphertextpolicy attributebased encryption scheme with expressive and flexible access policy for public domains. Attributebased encryption abe enables limiting access to encrypted data to users with certain attributes. Abstract in attributebased encryption abe scheme, attributes play a crucial role. Privacypreserving decentralized keypolicy attributebased. These messages will be encrypted with a key and at the time. Every authority can join or leave the system at any time freely. A privacypreserving decentralized ciphertextpolicy attributebased encryption cpabe scheme is a variant of the multiauthority attributebased encryption schemes where it requires neither a.
The scheme preserves the user privacy when users interact with multiple authorities to obtain decryption keys while mitigating the wellknown user collusion security vulnerability. 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. Collusion attack on decentralized keypolicy attributebased encryption scheme. Privacypreserving decentralized key policy attributebased. Improving privacy and security in decentralized ciphertextpolicy. There have been several efforts to propose decentralized abe schemes in. Pdf user collusion avoidance scheme for privacypreserving. The application of this scheme is restricted in the real environment because it use the access of monotonic attributes to control users access in the system. We further extend our mas construction to nonmonotone access structure nonmas in order to support negative attributes.
Decentralized ciphertextpolicy attributebased encryption. Meanwhile, a user can obtain secret keys from multiple authorities without releasing his global identifier gid and attributes to them. In this paper, we propose a privacypreserving decentralized keypolicy abe scheme where each authority can issue secret keys to a. User collusion avoidance scheme for privacy preserving decentralized key policy attribute based encryption y rahulamathavan, s veluru, j han, f li, m rajarajan, r lu ieee transactions on computers 65 9, 29392946, 2015. Parallel and distributed systems, ieee transactions on 20. Pdf privacypreserving decentralized keypolicy attributebased.
Security analysis of a privacypreserving decentralized. Most often abe schemes are constructed using bilinear pairing which has a higher computational complexity, making algorithms inefficient to some extent. An efficient approach to secure personal health record. In cpabe, data owner chooses an access structure on attributes and encrypts data with the. In previous privacypreserving multiauthority attributebased encryption ppmaabe schemes, a user can acquire secret keys from multiple. The drawback of this approach is that it compromises the users privacy. And a cloud is unaware about identity of user who stores data, but it can only check the users credentials through access policies generated by the attribute based encryption. While the number theorybased hardness problems are prone to quantum attacks, latticebased hardness problems can resist such attacks. Cipherpolicy attributebased encryption cpabe is a more efficient and flexible encryption.
Though cloud technology has numerous advantages, there are several privacy and security issues involved. Decentralized privacy preserving modified macpaber scheme. Decentralized key policy attribute based encryption is supporting attribute based encryption. The proposed framework combines attribute based encryption abe and attribute based signature abs mechanisms, while considering a twolevel access control model. In 2005, sahai and waters proposed the concept of fuzzy identity encryption, which became a precedent for attributebased encryption. Privacypreserving personal health record system using. Improving privacy and security in decentralized cipher textpolicy attributebased encryption, 6. Meanwhile patients maintain full control over access to their phr les.
Attribute based encryption abe is used for achieving data confidentiality and access control in cloud environments. Request pdf privacypreserving decentralized keypolicy attributebased encryption decentralized attributebased encryption abe is a variant of a. Decentralized access control of data in cloud services. Attributebased encryption abe is considered a promising technique for cloud storage where multiple accessors may read the same file. 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. An abe scheme which can deal with the aforementioned problem is socalled a decentralized or multiauthority abe scheme. Decentralized access control of data in cloud services using key policy attribute based encryption s. Attributes have been utilized to generate a public key for encrypting data. In this paper, we propose a privacy preserving decentralized cpabe ppdcpabe scheme where the central authority is not required. We stress that in keypolicy abe, the encryptor exerts no control over who has access to the data she encrypts, except by her choice. 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.
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