1. QR Code Authentication with Embedded Message Authentication Code
Source: Mobile Networks and Applications, pp , (published online: 17 Nov. 2016)
Authors: Changsheng Chen
Speaker: Huang Peng-Cheng
Date: 12/2/2018
Shenzhen Univesity

2. Outline Related Works The Proposed Scheme Experimental results
Conclusions
Comments

3. Related works(1/2) --QR code
The structure for QR code of version 6 with error correction level medium

4. Related Works(2/2)
The mask operation in the QR code generation process.

5. The proposed scheme (1/4)

6. The proposed scheme (2/4)

7. The proposed scheme (3/4) --The choice of cryptography algorithms
Using message authentication code with symmetric cryptography
where only a single party is involved in the barcode enrollment
and authentication.
Universal Message Authentication Code (UMAC)
F: AES=>41 bytes
the length of S is designed to be 4, 8, 12, or 16 bytes
Application: applied on preventing receipt forgery in return fraud

8. The proposed scheme (4/4) --The choice of cryptography algorithms
Using digital signature with asymmetric cryptography
where multiple parties is involved in the barcode enrollment and authentication.
The Elliptic Curve Digital Signature Algorithm (ECDSA)
Application: payment information authentication

9. Experimental results (1/5) --Decoding performances

10. Experimental results (2/5) --Decoding performances

11. Experimental results (3/5) --Decrement of barcode module size

12. Experimental results (4/5) --Security considerations on data authentication
For the case using message authentication code:
The length of UAMC L is 4, 8, 12, or 16 bytes
For the case using digital signature :
the ECDSA signature is of 41 bytes, so L=41

13. Experimental results (5/5) --Comparisons of embedding capacity with the existing data embedding approaches
17. Yang H, Kot AC (2007) Pattern-based data hiding for binary image
authentication by connectivity-preserving. IEEE Trans Multimedia 9(3):475–486
18. Yang H, Kot AC, Rahardja S (2008) Orthogonal data embedding for binary images in morphological transform domain- a high-capacity approach. IEEE Trans Multimedia 10(3):339–351

14. Conclusions
Off-line certification
High security
High capacity

15. comments
The approach is implemented with the error correction mechanism of QR code.
Embed the authentication code by using data hiding approach.
The secret payload can be improved by exploiting the characteristic of RS code.