Mediated Ciphertext-Policy Attribute-Based Encryption and Its Application
نویسندگان
چکیده
In Ciphertext-Policy Attribute-Based Encryption (CP-ABE), a user secret key is associated with a set of attributes, and the ciphertext is associated with an access policy over attributes. The user can decrypt the ciphertext if and only if the attribute set of his secret key satisfies the access policy specified in the ciphertext. Several CP-ABE schemes have been proposed, however, some practical problems, such as attribute revocation, still needs to be addressed. In this paper, we propose a mediated Ciphertext-Policy Attribute-Based Encryption (mCP-ABE) which extends CP-ABE with instantaneous attribute revocation. Furthermore, we demonstrate how to apply the proposed mCP-ABE scheme to securely manage Personal Health Records (PHRs).
منابع مشابه
DoS-Resistant Attribute-Based Encryption in Mobile Cloud Computing with Revocation
Security and privacy are very important challenges for outsourced private data over cloud storages. By taking Attribute-Based Encryption (ABE) for Access Control (AC) purpose we use fine-grained AC over cloud storage. In this paper, we extend previous Ciphertext Policy ABE (CP-ABE) schemes especially for mobile and resource-constrained devices in a cloud computing environment in two aspects, a ...
متن کاملFlexible Attribute-Based Encryption
In this paper, we propose a notion of flexible attribute-based encryption. Flexible attribute-based encryption is a variant of ciphertextpolicy ABE, which allows one to loosen a decryption policy underlying a given ciphertext, if one knows some system-wide trapdoor information, without knowing its underlying plaintext message. We give a concrete construction of the flexible attribute-based encr...
متن کاملChosen Ciphertext Secure Ciphertext-Policy Attribute-Based Encryption with Constant Ciphertext Length and Threshold Policy
A ciphertext-policy attribute-based encryption scheme allows that an encrypter assigns a decryption policy to ciphertexts. Any user will be able to decrypt if and only if a set of attributes (his private key) satisfy the assigned decryption policy. In this paper we first propose a new chosen ciphertext secure ciphertext-policy attribute-based encryption scheme with constant-size ciphertext and ...
متن کاملCiphertext Policy Attribute based Encryption with anonymous access policy
In Ciphertext Policy Attribute based Encryption scheme, the encryptor can fix the policy, who can decrypt the encrypted message. The policy can be formed with the help of attributes. In CP-ABE, access policy is sent along with the ciphertext. We propose a method in which the access policy need not be sent along with the ciphertext, by which we are able to preserve the privacy of the encryptor. ...
متن کاملCiphertext-Policy Attribute-based Keyword Search with Revocation in Cloud through LSSS Approach
In the cloud computing, attribute-based encryption and public key encryption with keyword search are two popular issues. Ciphertext-policy attribute-based encryption is famous for its fine-grained access control. Keyword Search over encrypted files is an important function in the actual situation. We particularly concern the problem of revocation. Additionally, several solutions of the dynamic ...
متن کامل