[ACM Press the 13th ACM conference - Alexandria, Virginia, USA (2006.10.30-2006.11.03)] Proceedings of the 13th ACM conference on Computer and communications security - CCS '06 - Attribute-based encryption for fine-grained access control of encrypted data

✍ Scribed by Goyal, Vipul; Pandey, Omkant; Sahai, Amit; Waters, Brent

• Book ID: 120996408
• Publisher: ACM Press
• Year: 2006
• Tongue: English
• Weight: 271 KB
• Category: Article
• ISBN-13: 9781595935182
• DOI: 10.1145/1180405.1180418

✦ Synopsis

As more sensitive data is shared and stored by third-party sites on the Internet, there will be a need to encrypt data stored at these sites. One drawback of encrypting data, is that it can be selectively shared only at a coarse-grained level (i.e., giving another party your private key). We develop a new cryptosystem for fine-grained sharing of encrypted data that we call Key-Policy Attribute-Based Encryption (KP-ABE). In our cryptosystem, ciphertexts are labeled with sets of attributes and private keys are associated with access structures that control which ciphertexts a user is able to decrypt. We demonstrate the applicability of our construction to sharing of audit-log information and broadcast encryption. Our construction supports delegation of private keys which subsumes Hierarchical Identity-Based Encryption (HIBE).