Paper 2017/408
Combinatorial Subset Difference Public Key Broadcast Encryption Scheme for Secure Multicast
Jihye Kim and Seunghwa Lee and Jiwon Lee and Hyunok Oh
Abstract
Public key broadcast encryption is a cryptographic method to securely transmit a message from anyone to a group of receivers such that only privileged users can decrypt it. A secure multicast system allows a user to send a message to a dynamically changing group of users. The secure multicast can be realized by the broadcast encryption. In this paper, we propose a novel combinatorial subset difference (CSD) public key broadcast encryption algorithm which allows a generalized subset different representation in which wildcards can be placed at any position. The proposed CSD is applicable to a secure multicast as well as minimizes the header size compared with existing public key broadcast encryption schemes without sacrificing key storage and encryption/decryption performance. Experimental results show that the proposed CSD scheme not only reduces the ciphertext header size by 17% and 31% but also improves encryption performance (per subset) by 6 and 1.3 times, and decryption performance by 10 and 19 times compared with existing efficient subset difference (SD) and interval schemes, respectively. Furthermore, especially for subsets represented in a non-hierarchical manner, the proposed CSD reduces the number of subsets by a factor of 1000 times compared with SD and interval approaches. We prove semantic security of our proposed CSD scheme under l-BDHE assumption without the random oracle model.
Metadata
- Available format(s)
- Category
- Public-key cryptography
- Publication info
- Published elsewhere. Minor revision. ACM/SIGAPP Symposium on Applied Computing, 2018
- Keywords
- broadcast encryptionsecure multicastwildcardsubset differencepublic key
- Contact author(s)
- easyone518 @ gmail com
- History
- 2019-11-14: last of 4 revisions
- 2017-05-13: received
- See all versions
- Short URL
- https://ia.cr/2017/408
- License
-
CC BY