cgw15

Improved Dual System ABE (CGW15)

Authors: Jie Chen, Romain Gay, Hoeteck Wee

Title: “Improved Dual System ABE in Prime-Order Groups via Predicate Encodings”

Published in: EUROCRYPT, 2015

Available from: http://eprint.iacr.org/2015/409

Notes: Implemented the scheme in Appendix B.2

Scheme Properties

• Type: ciphertext-policy attribute-based encryption

• Setting: Pairing groups (prime order)

• Assumption: k-linear

Implementation

Authors:

Shashank Agrawal

Date:

05/2016

class cgw15.CGW15CPABE(groupObj, assump_size, uni_size, verbose=False)

Bases: ABEnc

decrypt(pk, ctxt, key)

Decrypt ciphertext ctxt with key key.

encrypt(pk, msg, policy_str)

Encrypt a message M under a policy string.

keygen(pk, msk, attr_list)

Generate a key for a set of attributes.

setup()

Generates public key and master secret key.