Name
Abstract | ||
|---|---|---|
Broadcast encryption (BE) schemes allow a sender to securely broadcast to any subset of members but requires a trusted party to distribute decryption keys. Group key agreement (GKA) protocols enable a group of members to negotiate a common encryption key via open networks so that only the members can decrypt the ciphertexts encrypted under the shared encryption key, but a sender cannot exclude any particular member from decrypting the ciphertexts. In this paper, we bridge these two notions with a hybrid primitive referred to as contributory broadcast encryption (CBE). In this new primitive, a group of members negotiate a common public encryption key while each member holds a decryption key. A sender seeing the public group encryption key can limit the decryption to a subset of members of his choice. Following this model, we propose a CBE scheme with short ciphertexts. The scheme is proven to be fully collusion-resistant under the decision n-Bilinear Diffie-Hellman Exponentiation (BDHE) assumption in the standard model. We also illustrate a variant in which the communication and computation complexity is sub-linear with the group size. Of independent interest, we present a new BE scheme that is aggregatable. The aggregatability property is shown to be useful to construct advanced protocols. |
Year | DOI | Venue |
|---|---|---|
2011 | 10.1007/978-3-642-25385-0_8 | ASIACRYPT |
Keywords | Field | DocType |
common public encryption key,cbe scheme,public group encryption key,contributory broadcast encryption,decryption key,group size,broadcast encryption,shared encryption key,group key agreement,common encryption key,provable security | Multiple encryption,Broadcast encryption,Computer science,Computer security,Attribute-based encryption,Keyfile,Encryption,40-bit encryption,Probabilistic encryption,On-the-fly encryption | Conference |
Volume | ISSN | Citations |
7073 | 0302-9743 | 21 |
PageRank | References | Authors |
0.64 | 30 | 5 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Qianhong Wu | 1 | 1013 | 66.94 |
| Bo Qin | 2 | 422 | 30.44 |
| Lei Zhang | 3 | 50 | 2.63 |
| Josep Domingo-Ferrer | 4 | 3231 | 404.42 |
| Oriol Farràs | 5 | 197 | 15.52 |