TY - GEN
T1 - On efficient ciphertext-policy attribute based encryption and broadcast encryption
AU - Zhou, Zhibin
AU - Huang, Dijiang
N1 - Copyright:
Copyright 2011 Elsevier B.V., All rights reserved.
PY - 2010
Y1 - 2010
N2 - Existing CP-ABE schemes incur very large ciphertext size, which increases linearly with respect to the number of attributes in the access policy. Large ciphertext prevents CPABE from being adopted in the communication constrained environments. In this paper, we proposed a new construction of CP-ABE, named Constant-size CP-ABE (denoted as CCP-ABE) that significantly reduces the ciphertext to a constant size for an AND gate access policy with any given number of attributes. Each ciphertext in CCP-ABE requires only 2 elements on a bilinear group. Based on CCP-ABE, we further proposed an Attribute Based Broadcast Encryption (ABBE) scheme. Compared to existing Broadcast Encryption (BE) schemes, ABBE is more flexible because a broadcasted message can be encrypted by an expressive access policy, either with or without explicit specifying the receivers. Moreover, ABBE significantly reduces the storage and communication overhead to the order of O(logN), where N is the system size.
AB - Existing CP-ABE schemes incur very large ciphertext size, which increases linearly with respect to the number of attributes in the access policy. Large ciphertext prevents CPABE from being adopted in the communication constrained environments. In this paper, we proposed a new construction of CP-ABE, named Constant-size CP-ABE (denoted as CCP-ABE) that significantly reduces the ciphertext to a constant size for an AND gate access policy with any given number of attributes. Each ciphertext in CCP-ABE requires only 2 elements on a bilinear group. Based on CCP-ABE, we further proposed an Attribute Based Broadcast Encryption (ABBE) scheme. Compared to existing Broadcast Encryption (BE) schemes, ABBE is more flexible because a broadcasted message can be encrypted by an expressive access policy, either with or without explicit specifying the receivers. Moreover, ABBE significantly reduces the storage and communication overhead to the order of O(logN), where N is the system size.
KW - Attribute-based Encryption
KW - Broadcast Encryption
UR - http://www.scopus.com/inward/record.url?scp=78650001392&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78650001392&partnerID=8YFLogxK
U2 - 10.1145/1866307.1866420
DO - 10.1145/1866307.1866420
M3 - Conference contribution
AN - SCOPUS:78650001392
SN - 9781450302449
T3 - Proceedings of the ACM Conference on Computer and Communications Security
SP - 753
EP - 755
BT - CCS'10 - Proceedings of the 17th ACM Conference on Computer and Communications Security
T2 - 17th ACM Conference on Computer and Communications Security, CCS'10
Y2 - 4 October 2010 through 8 October 2010
ER -