aggrsign_bls

BLS Multi-Signatures (BLS)

Authors: Dan Boneh, Manu Drijvers, Gregory Neven

Title: “BLS Multi-Signatures With Public-Key Aggregation”

Available from: https://crypto.stanford.edu/~dabo/pubs/papers/BLSmultisig.html

Notes: Includes both vulnerable and rogue-public-key-resistant aggregation methods

Scheme Properties

• Type: aggregate signature

• Setting: bilinear groups (asymmetric)

• Assumption: CDH in G1

Implementation

Authors:

Lovesh Harchandani

Date:

5/2018

class aggrsign_bls.BLSAggregation(groupObj)

Bases: object

static aggregate_pub_key(pks)

aggregate_sigs_safe(pubkey_signatures)

aggregate_sigs_vulnerable(signatures)

This method of aggregation is vulnerable to rogue public key attack

static check_and_return_same_generator_in_public_keys(public_keys)

static dump(obj)

static hash_keys(pk, all_pks)

keygen(g, secparam=None)

static product(seq)

sign(x, message)

verify(pk, sig, message)

verify_aggregate_sig_safe(message, aggregate_sig, public_keys)

verify_aggregate_sig_vulnerable(message, aggregate_sig, public_keys)

aggrsign_bls.defend_rogue_public_key_attack()

aggrsign_bls.demo_rogue_public_key_attack()

aggrsign_bls.safe()

aggrsign_bls.vulnerable()