Privacy-preserving decentralized key-policy attribute-based encryption pdf

In the han, et al scheme, the first privacy preserving decentralized kpabe encryption algorithm is proposed. 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. 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. 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. Improving privacypreserving and security for decentralized. Accountable privacy preserving attribute based framework for. 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. Privacypreserving decentralized key policy attributebased.

Privacypreserving decentralized keypolicy attributebased. In this paper, we propose a user collusion avoidance scheme which preserves the users privacy when they interact with. User collusion avoidance scheme for privacypreserving. Privacy preserving decentralized key policy attribute. In a traditional attributebased encryption abe system, there is only one central authority who generates and hence knows the secret keys of all users, this problem is known as the key escrow problem. Abstract in attributebased encryption abe scheme, attributes play a crucial role. Decentralized access control of data in cloud services. Privacypreserving personal health record system using. In this paper, we propose a privacypreserving decentralized cpabe ppdcpabe scheme where the central authority is not required. Jinguang han, student member, ieee, willy susilo, senior member, ieee. 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. Therefore, even if multiple authorities are corrupted, they cannot collect the users attributes by.

Feb 03, 2016 the data confidentiality in a distributed environment can be achieved by using attribute based encryption technique. Attribute based encryption with key cloning protection m. In abka protocols, attribute based encryption abe plays important role in protecting secret messages used to generate session keys. In the proposed scheme, each authority can join or leave the system randomly without reinitializing the system,and issue secretpublic keys to user. The drawback of this approach is that it compromises the users privacy. Cipherpolicy attributebased encryption cpabe is a more efficient and flexible encryption. Decentralized key policy attribute based encryption is supporting attribute based encryption. Though cloud technology has numerous advantages, there are several privacy and security issues involved. 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.

Feb 03, 2016 in this paper, we propose a privacy preserving decentralized key policy attribute based encryption scheme. Attributebased encryption with key cloning protection. 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. 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. An abe scheme which can deal with the aforementioned problem is socalled a decentralized or multiauthority abe scheme. 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 this paper, we propose a privacypreserving decentralized keypolicy abe scheme where each authority can issue secret keys to a. Cloudbased finegrained health information access control framework for lightweight iot devices. Attributebased encryption abe enables limiting access to encrypted data to users with certain attributes. Multiauthority attributebased encryption abe scheme can support the. Where all messages are created with their attributes and some policies designed by same attributes and stores encrypted messages to data store. Notably, a users identity information can be extracted from hisher some sensitive attributes. A new decentralized access control scheme for secure data storage in clouds that supports anonymous authentication. Cipherpolicy attributebased encryptioncpabe isa more e.

Ltd we are ready to provide guidance to successfully complete your projects and also download the abstract, base paper from our web. Decentralized policyhiding abe with receiver privacy. An efficient tate pairing algorithm for a decentralized key. 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. Decentralized attributebased encryption, key policy, collusion attack, dbdh assumption. 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. An efficient approach to secure personal health record. 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. In this paper, we propose a privacypreserving decentralized keypolicy abe scheme where each authority can issue secret keys to a user independently without. To make multiauthority abe schemes collusionresistant, a user in the system must be tied with a globally verifiable identifier gid. Decentralized attribute based encryption technique is a variant of multiple. Message privacy with load balancing using attribute based. There have been several efforts to propose decentralized abe schemes in.

Pdf user collusion avoidance scheme for privacypreserving. Privacypreserving attribute based searchable encryption. User collusion avoidance scheme for privacypreserving decentralized keypolicy attributebased encryption. One is keypolicy attributebased encryption kpabe and the other is ciphertextpolicy attributebased encryption cpabe. A novel privacypreserving decentralized ciphertextpolicy. We further extend our mas construction to nonmonotone access structure nonmas in order to support negative attributes. Collusion attack on decentralized keypolicy attributebased encryption scheme. Attribute based encryption with privacy preserving and. Therefore, constructing a decentralized abe scheme with privacy preserving remains a challenging research problem. They are key policy abe kpabe scheme and ciphertext policy abe cpabe scheme.

In this thesis, we propose a privacy preserving phr system using attribute based encryption abe. 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. 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. 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 central authority nor cooperation among authorities for issuing secret keys. Pdf privacypreserving decentralized keypolicy attributebased. Improving privacy and security in decentralized cipher textpolicy attributebased encryption, 6. Security analysis of a privacypreserving decentralized keypolicy attributebased encryption scheme. In cpabe, data owner chooses an access structure on attributes and encrypts data with the. 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. Pdf privacypreserving decentralized keypolicy attribute. 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. Security analysis of a privacypreserving decentralized.

In this paper, we propose a privacy preserving decentralized key policy attribute based. 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 system, patients can encrypt their phrs and store them on semitrusted cloud servers such that servers do not have access to sensitive phr contexts. 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. In this paper, we propose a privacypreserving decentralized key.

This scheme eliminates the heavy communication cost. Confidentialitypreserving based on attribute encryption. While the number theorybased hardness problems are prone to quantum attacks, latticebased hardness problems can resist such attacks. Attribute based encryption with privacy preserving in clouds. 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. 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. However, in the previous multiauthority abe schemes, the access policy is. Attribute based encryption abe is used for achieving data confidentiality and access control in cloud environments. 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. In previous privacypreserving multiauthority attributebased encryption ppma abe schemes, a user can acquire secret keys from multiple authorities with. Next, the decentralized key policy attribute based encryption introduced by han et al. Decentralized ciphertextpolicy attributebased encryption. Attributebased encryption with verifiable delegation is decryption scheme to reduced the computation cost during decryption.

The scheme preserves the user privacy when users interact with. Abe was mainly divided into two categories called ciphertext policy abe cpabe and key policy abe kpabe. 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. 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. Privacy preserving through mediator in decentralized ciphertext policy attribute based encryption varsha thanaji mulik1, shinu acca mani2, saritha k3, suraj u rasal4 1 m. Privacypreserving decentralized ciphertextpolicy attributebased encryption cipherpolicy attributebased encryption cpabe is a more. Improving privacy and security in decentralized ciphertext. In this paper, we propose a privacypreserving decentralized keypolicy abe scheme where each.

In this paper, we propose a privacypreserving decentralized keypolicy attributebased encryption scheme. 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. In previous privacypreserving multiauthority attributebased encryption ppmaabe schemes, a user can acquire secret keys from multiple. 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. In this paper, we propose a privacy preserving decentralized cpabe ppdcpabe scheme where the central authority is not required. In this paper, we construct a decentralized ciphertextpolicy attributebased encryption dcpabe scheme. To achieve this, encryption schemes can be employed to protect the con. We stress that in keypolicy abe, the encryptor exerts no control over who has. Survey on revocation in ciphertextpolicy attributebased. Improving privacy and security in decentralized ciphertextpolicy. Modified ciphertextpolicy attributebased encryption. Twoparty attributebased key agreement protocol with. Managing and using industrial big data is a big challenge for every industrial enterprise manager.

In this paper, we propose a privacy preserving decentralized cpabe. Currently, abe schemes can be classified as two types. Meanwhile, a user can obtain secret keys from multiple authorities without releasing his global identifier gid and attributes to them. The major difference between them lies in how to associate a secret key and an access policy with relevant data and attributes. In an open communication environment, such as the internet, sensitive data must be encrypted prior to being transmitted. There are two variants of abe ciphertext policy attribute based encryption cpabe2 and key policy attribute based encryption kp. Hence, existing ppmaabe schemes cannot fully protect users. The proposed framework combines attribute based encryption abe and attribute based signature abs mechanisms, while considering a twolevel access control model. A decentralized multiauthority ciphertextpolicy attribute.

Cipherpolicy attributebased encryption cpabe is a more efficient and. European symposium on research in computer security, computer securityesorics 2014. Most often abe schemes are constructed using bilinear pairing which has a higher computational complexity, making algorithms inefficient to some extent. Protecting user privacy by using decentralized keypolicy. 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. Parallel and distributed systems, ieee transactions on 20. Privacypreserving decentralized ciphertextpolicy attribute. 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. Therefore, constructing a decentralized abe scheme with privacypreserving remains a challenging research problem. The motivation of this paper is on achieving user privacy during the interaction with attribute authorities by improving the.

Attributebased encryption abe is considered a promising technique for cloud storage where multiple accessors may read the same file. Shahandashti3 1 icore information security lab, dept of cs, university of calgary, calgary, canada. By using the cloud technology, enterprises can handover the task of heavy data management to reliable hands and focus on their main business. Request pdf privacypreserving decentralized keypolicy attributebased encryption decentralized attributebased encryption abe is a variant of a. A privacypreserving decentralized ciphertextpolicy attributebased encryption cpabe scheme is a variant of the multiauthority attributebased encryption schemes where it requires neither a. Ekmi uses a new decentralized key policy attribute based encryption dkpabe with user revocation in private domain and multi. Different aspects of abe were studied, such as the multiauthority setting maabe, and policy hiding, meaning the access policy is unknown to unauthorized parties. These messages will be encrypted with a key and at the time. These variants are ciphertext policy attribute based encryption cpabe and key policy attributebased encryption kpabe. In 2005, sahai and waters proposed the concept of fuzzy identity encryption, which became a precedent for attributebased encryption. We present an efficient decentralized attributebased encryption abe that supports any monotone access structure mas with faster. Decentralized access control of data in cloud services using key policy attribute based encryption s.

Every authority can join or leave the system at any time freely. In this paper, we propose a privacypreserving decentralized cpabe ppdcpabe scheme where the central authority is not required, namely each authority can. Privacypreserving decentralized key policy attribute. Privacypreserving multiauthority attributebased encryption. Meanwhile patients maintain full control over access to their phr les. 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. Here multiple authorities need not be online always. Decentralized attribute based encryption, key policy, collusion attack, dbdh assumption.

We present an efficient decentralized attributebased encryption abe that supports any monotone access structure mas with faster decryption capability in the keypolicy setting. We stress that in keypolicy abe, the encryptor exerts no control over who has access to the data she encrypts, except by her choice. The cloud server might tamper or replace the data owners original ciphertext for malicious attacks, and. In this paper, we present inspabac, an accountable privacy preserving attribute based framework, for an authenticated encrypted access to data outsourced to cloud servers. Decentralized privacy preserving modified macpaber scheme. Privacypreserving decentralized keypolicy attribute. The scheme preserves the user privacy when users interact with multiple authorities to obtain decryption keys while mitigating the wellknown user collusion security vulnerability.

The authors take a centralized approach where a single key distribution center kdc distributes secret keys and attributes to all users. 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. Our scheme supports multiauthority scenario, in which the. Attributes have been utilized to generate a public key for encrypting data. 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.