Revisiting Attribute-Based Encryption with Verifiable Outsourced Decryption

Information Technology

In this project main concept is to keep the data security and privacy for data owners is concern, the sharing data needs to be encrypted before being uploaded and fine grained access control is required. Attribute-based encryption (ABE) was thus proposed to have flexible Access control of encrypted data utilizing access policies and Attribute-based encryption (ABE) is a promising technique for fine grained access control of encrypted data in cloud storage, however, decryption involved in ABEs is usually too expensive for resource constrained front-end users, which greatly hinders its practical popularity. In order to reduce the decryption overhead for a user to recover the plain text, suggested the majority of the decryption work without revealing actually data or private keys. To ensure the third-party service honestly computes the outsourced work, provided a requirement of verifiability to the decryption of ABE, but their scheme doubled the size of the underlying ABE cipher text and the computation costs. Roughly speaking, their main idea is to use a parallel encryption technique, while one of the encryption components is used for the verification purpose. Hence the bandwidth and the computation cost are doubled. In that way propose a more efficient and generic construction of ABE with verifiable outsourced decryption (VO-ABE) based on an attribute-based key encapsulation mechanism (AB-KEM), a symmetric-key encryption scheme and a commitment scheme. Then in that, prove the security and the verification soundness of constructed ABE scheme in the standard model. Finally, instantiate this scheme with concrete building blocks. This scheme reduces the bandwidth and the computation costs almost by half. In this way prove that this system constructed ABE scheme is secure and meets the verification soundness in the standard model if the underlying building blocks are secure. Keywords: - encryption, decryption, verifiability, symmetric key

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