pksig_cyh

Chow-Yiu-Hui Identity-Based Ring Signature (CYH05)

Authors: S. Chow, S. Yiu, L. Hui

Title: “Efficient Identity Based Ring Signature”

Published in: ACNS, 2005

Available from: LNCS Vol. 3531, pages 499-512

Notes:

Scheme Properties

• Type: signature (ring-based)

• Setting: bilinear groups (asymmetric)

• Assumption: CDH

Implementation

Authors:

10. Ayo Akinyele

Date:

11/2011

class pksig_cyh.CYH(groupObj)

Bases: PKSig

>>> from charm.toolbox.pairinggroup import PairingGroup
>>> users = [ "alice", "bob", "carlos", "dexter", "eddie"] 
>>> signer = "bob"
>>> group = PairingGroup('SS512')
>>> cyh = CYH(group)
>>> (master_public_key, master_secret_key) = cyh.setup()
>>> (signer, public_key, secret_key) = cyh.keygen(master_secret_key, signer)  
>>> secret_key = (signer, public_key, secret_key)
>>> msg = 'please sign this new message!'
>>> signature = cyh.sign(secret_key, users, msg)
>>> cyh.verify(master_public_key, users, msg, signature)
True

concat(L_id)

keygen(msk, ID)

setup()

sign(sk, L, M)

verify(mpk, L, M, sig)

pksig_cyh.main()