PhD Seminar • Cryptography, Security, and Privacy (CrySP) — A Scalable Post-quantum Hash-based Group SignatureExport this event to calendar

Friday, March 13, 2020 — 11:00 AM EDT

Masoumeh Shafieinejad, PhD candidate
David R. Cheriton School of Computer Science

We present a construction for hash-based one-time group signature schemes, and develop a traceable post-quantum multi-time group signature upon it. A group signature scheme allows group members to anonymously sign a message on behalf of the whole group. The signatures are unforgeable and the scheme enables authorized openers to trace the signature back to the original signer when needed. 

Our construction utilizes three nested layers to build the group signature scheme. The first layer is key management; it deploys a transversal design to assign keys to the group members and the openers, providing the construction with traceability. The second layer utilizes hash pools to build the group public verification key, to connect group members together, and to provide anonymity. The final layer is a post-quantum hash-based signature scheme, that adds unforgeability to our construction. We extend our scheme to multi-time signatures by using Merkle trees, and show that this process keeps the scalability property of Merkle-based signatures, while it supports the group members signing any number of messages.

Location 
DC - William G. Davis Computer Research Centre
1304
200 University Avenue West

Waterloo, ON N2L 3G1
Canada

S M T W T F S
26
27
28
29
30
31
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
  1. 2020 (52)
    1. May (1)
    2. April (1)
    3. March (6)
    4. February (22)
    5. January (22)
  2. 2019 (255)
    1. December (21)
    2. November (25)
    3. October (16)
    4. September (20)
    5. August (18)
    6. July (12)
    7. June (23)
    8. May (23)
    9. April (32)
    10. March (25)
    11. February (16)
    12. January (24)
  3. 2018 (220)
  4. 2017 (36)
  5. 2016 (21)
  6. 2015 (36)
  7. 2014 (33)
  8. 2013 (23)
  9. 2012 (4)
  10. 2011 (1)
  11. 2010 (1)
  12. 2009 (1)
  13. 2008 (1)