Name
Abstract | ||
|---|---|---|
We propose the first fully secure unbounded Attribute-Based Encryption (ABE) scheme such that the key size and ciphertext size can be directly traded off. Our proposed scheme is parameterized by a positive integer d, which can be arbitrarily chosen at setup. In our scheme, the ciphertext size is O(t/d), the private key size is O(md), and the public key size is O(d), where t, m are the sizes of attribute sets and policies corresponding to ciphertext and private key, respectively. Our scheme can be considered as a generalization that includes two of the state-of-the-art ABE instantiations, namely, the unbounded ABE scheme and the ABE scheme with constant-size ciphertexts proposed by Attrapadung (Eurocrypt 2014). Indeed, these two schemes correspond to the two extreme cases of our scheme, that is, when setting d = 1 and when setting d as the maximum size of allowed attribute sets, respectively. Furthermore, our scheme also yields a tradeoff between encryption and decryption time. Interestingly, when estimating efficiency using numerical parameters, the decryption time is minimized at d being somewhere in the middle of the spectrum. We believe that this tradeoff can provide advantages in applications where size and/or time resources are concretely fixed in advance, as we can flexibly adjust d to match available resources and thus make the most of them. Such situations include, but are not limited to, implementations of ABE in tiny hardware tokens. |
Year | DOI | Venue |
|---|---|---|
2016 | 10.1007/978-3-319-39555-5_14 | Lecture Notes in Computer Science |
Keywords | Field | DocType |
Attribute-based encryption,Efficiency tradeoff,Unbounded,Short ciphertext,Full security | Computer security,Computer science,Deterministic encryption,Attribute-based encryption,Plaintext-aware encryption,Encryption,Theoretical computer science,40-bit encryption,Probabilistic encryption,Ciphertext,Key size | Conference |
Volume | ISSN | Citations |
9696 | 0302-9743 | 4 |
PageRank | References | Authors |
0.39 | 19 | 5 |
Name | Order | Citations | PageRank |
|---|---|---|---|
| Nuttapong Attrapadung | 1 | 811 | 39.85 |
| Goichiro Hanaoka | 2 | 910 | 101.53 |
| Tsutomu Matsumoto | 3 | 1156 | 197.58 |
| Tadanori Teruya | 4 | 101 | 10.48 |
| Shota Yamada | 5 | 94 | 18.10 |