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Paper 2019/1437

Reverse Outsource: Reduce the Cloud's Workload in Outsourced Attribute-Based Encryption Scheme

Fei Meng and Mingqiang Wang

Abstract

Ciphertext-policy attribute-based encryption (CP-ABE) is a cryptographic technique known for ensuring fine-grained access control on encrypted data. However, one of the main drawbacks of CP-ABE is that the time required to decrypt the ciphertext is considerably expensive, since it grows with the complexity of access policy. Outsourcing partial decryption operations to the cloud eliminates the overheads for users, but it also inevitably increases the computational burden of the cloud. When millions of users are enjoying cloud computing services, it may cause huge congestion and latency. In this paper, we propose a heuristic primitive called reverse outsourcing. Specifically, users outsource part of the decryption work to the cloud, which splits it up and dispatches each to different idle users. Idle users are those whos has some smart devices connected to the internet and not in use. It's like, the cloud employs many idle users to accomplish its own computing tasks. Then, we proposed a reverse outsourced CP-ABE scheme which provable secure under the BDBH assumptions.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
Preprint. MINOR revision.
Keywords
attribute-based encryptionoutsourced decryption.
Contact author(s)
mengfei_sdu @ 163 com
History
2020-04-22: last of 3 revisions
2019-12-10: received
See all versions
Short URL
https://ia.cr/2019/1437
License
Creative Commons Attribution
CC BY
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