As the primary contribution of our work, we establish an important (and somewhat surprising) connection between verifiable computation and attribute-based encryption (ABE), a primitive that has been widely studied. Namely, we show how to construct a VC scheme with public delegation and public verifiability from any ABE scheme. The VC scheme verifies any function in the class of functions covered by the permissible ABE policies. This scheme enjoys a very efficient verification algorithm that depends only on the output size. Strengthening this connection, we show a construction of a multi-function verifiable computation scheme from an ABE with outsourced decryption, a primitive defined recently by Green, Hohenberger and Waters (USENIX Security 2011). A multi-function VC scheme allows the verifiable evaluation of multiple functions on the same preprocessed input.
In the other direction, we also explore the construction of an ABE scheme from verifiable computation protocols.Category / Keywords: cryptographic protocols / Verifiable, Computation, Delegation, Public-Key Cryptography, Attribute-Based Encryption Date: received 3 Nov 2011 Contact author: parno at microsoft com Available format(s): PDF | BibTeX Citation Version: 20111107:174819 (All versions of this report) Discussion forum: Show discussion | Start new discussion