pksig_waters09

Waters Dual System Signature (Waters09)

Authors: B. Waters

Title: “Dual System Encryption: Realizing Fully Secure IBE and HIBE under Simple Assumptions”

Published in: CRYPTO, 2009

Available from: http://eprint.iacr.org/2009/385.pdf

Notes: Minor improvements: removed alpha from msk, added g2^-alpha.

Scheme Properties

• Type: signature (identity-based)

• Setting: bilinear groups (asymmetric)

• Assumption: DLIN

Implementation

Authors:

10. Ayo Akinyele (original), Fan Zhang (improvements)

Date:

2/2012 (original), 3/2013 (improvements)

class pksig_waters09.IBEWaters09(groupObj)

Bases: IBEnc

>>> group = PairingGroup('MNT224')
>>> ibe = IBEWaters09(group)
>>> (master_public_key, master_secret_key) = ibe.keygen()
>>> msg = "plese sign this message!!!!"
>>> signature = ibe.sign(master_public_key, master_secret_key, msg)
>>> ibe.verify(master_public_key, signature, msg)
True

keygen()

sign(mpk, msk, m)

verify(mpk, sigma, m)

pksig_waters09.main()