We also extend the paradigm of hybrid encryption to the ciphertext policy attribute-based encryption schemes. A new primitive called encapsulation policy attribute-based key encapsulation mechanism (EP-AB-KEM) is introduced and a notion of chosen ciphertext security is defined for EP-AB-KEMs. We propose an EP-AB-KEM from an existing attribute-based encryption scheme and show that it achieves chosen ciphertext security in the generic group and random oracle models.
We present a generic one-round AB-AKE protocol that satisfies our AKE-security notion. The protocol is generically constructed from any EP-AB-KEM that satisfies chosen ciphertext security. Instantiating the generic AB-AKE protocol with our EP-AB-KEM will result in a concrete one-round AB-AKE protocol also secure in the generic group and random oracle models.Category / Keywords: Attribute-based Key Exchange, Attribute-based KEM, Group Key Exchange Publication Info: To appear at ACISP 2010. This is full version with proofs. Date: received 16 Feb 2010, last revised 24 Apr 2010 Contact author: mc gorantla at gmail com Available formats: PDF | BibTeX Citation Note: A section on hybrid CP-ABE has been added. A few typos have been corrected. Version: 20100424:175046 (All versions of this report) Discussion forum: Show discussion | Start new discussion