abenc_bsw07

John Bethencourt, Brent Waters (Pairing-based)

From: “Ciphertext-Policy Attribute-Based Encryption”.

Published in: 2007

Available from:

Notes:

Security Assumption:

type: ciphertext-policy attribute-based encryption (public key)

setting: Pairing

Authors:J Ayo Akinyele Date:04/2011

class abenc_bsw07.CPabe_BSW07(groupObj)

Bases: charm.toolbox.ABEnc.ABEnc

>>> from charm.toolbox.pairinggroup import PairingGroup,ZR,G1,G2,GT,pair
>>> group = PairingGroup('SS512')
>>> cpabe = CPabe_BSW07(group)
>>> msg = group.random(GT)
>>> attributes = ['ONE', 'TWO', 'THREE']
>>> access_policy = '((four or three) and (three or one))'
>>> (master_public_key, master_key) = cpabe.setup()
>>> secret_key = cpabe.keygen(master_public_key, master_key, attributes)
>>> cipher_text = cpabe.encrypt(master_public_key, msg, access_policy)
>>> decrypted_msg = cpabe.decrypt(master_public_key, secret_key, cipher_text)
>>> msg == decrypted_msg
True

decrypt(*args)

encrypt(*args)

keygen(*args)

setup(*args)

abenc_bsw07.main()