waters11

Brent Waters

From: “Ciphertext-Policy Attribute-Based Encryption: An Expressive, Efficient, and Provably Secure Realization”

Published in: 2011

Available from: https://doi.org/10.1007/978-3-642-19379-8_4

Notes: Implemented an asymmetric version of the scheme in Section 3

Security Assumption: Decisional Parallel Bilinear Diffie-Hellman Exponent

type: ciphertext-policy attribute-based encryption

setting: Pairing

Authors:Shashank Agrawal Date:05/2016

class waters11.Waters11(group_obj, uni_size, verbose=False)

Bases: charm.toolbox.ABEnc.ABEnc

decrypt(pk, ctxt, key)

Decrypt ciphertext ctxt with key key.

encrypt(pk, msg, policy_str)

Encrypt a message M under a monotone span program.

keygen(pk, msk, attr_list)

Generate a key for a set of attributes.

setup()

Generates public key and master secret key.