Abstract
Ciphertext-Policy Attribute-Based Encryption (CP-ABE) allows to encrypt data under an access policy, specified as a logical combination of attributes. Such ciphertexts can be decrypted by anyone with a set of attributes that fits the policy. In this paper, we introduce the concept of Distributed Attribute-Based Encryption (DABE), where an arbitrary number of parties can be present to maintain attributes and their corresponding secret keys. This is in stark contrast to the classic CP-ABE schemes, where all secret keys are distributed by one central trusted party. We provide the first construction of a DABE scheme; the construction is very efficient, as it requires only a constant number of pairing operations during encryption and decryption.
| Original language | English |
|---|---|
| Pages (from-to) | 20-36 |
| Number of pages | 17 |
| Journal | Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) |
| Volume | 5461 |
| DOIs | |
| State | Published - 2009 |
| Externally published | Yes |
| Event | 11th International Conference on Information Security and Cryptology, ICISC 2008 - Seoul, Korea, Republic of Duration: 3 Dec 2008 → 5 Dec 2008 |