1. Handbook of Applied Cryptography - CH11, from 11.5~11.8
Soon-Woong Min

2. Agenda
11.5 The Digital Signature Algorithm (DSA)
11.6 One-time digital signatures
11.7 Other signature schemes
11.8 Signatures with additional functionality

3. 11.5 The Digital Signature Algorithm (DSA)
Authentication : Bob wants to be sure that his communication partner is Alice.
Data integrity :
Bob wants to be sure that Alice’s message has not been altered.
i.e., contain no modification, insertion or deletion
Non-repudiation :
Alice cannot claim that she did not send the message, if she actually sent it.
This service is particularly important in electronic commerce applications, where it is important that a consumer cannot deny the authorization of a purchase.

4. 11.5 The Digital Signature Algorithm (DSA)
Authentication : Bob wants to be sure that his communication partner is Alice.
Data integrity :
Bob wants to be sure that Alice’s message has not been altered.
i.e., contain no modification, insertion or deletion
Non-repudiation :
Alice cannot claim that she did not send the message, if she actually sent it.
This service is particularly important in electronic commerce applications, where it is important that a consumer cannot deny the authorization of a purchase.

5. 11.5 The Digital Signature Algorithm (DSA)
Authentication : Bob wants to be sure that his communication partner is Alice.
Data integrity :
Bob wants to be sure that Alice’s message has not been altered.
i.e., contain no modification, insertion or deletion
Non-repudiation :
Alice cannot claim that she did not send the message, if she actually sent it.
This service is particularly important in electronic commerce applications, where it is important that a consumer cannot deny the authorization of a purchase.

6. 11.5 The Digital Signature Algorithm (DSA)

7. 11.5 The Digital Signature Algorithm (DSA)

8. 11.5 The Digital Signature Algorithm (DSA)
consists

9. 11.5 The Digital Signature Algorithm (DSA)
consists

10. 11.5 The Digital Signature Algorithm (DSA)
consists

11. 11.5 The Digital Signature Algorithm (DSA)

12. 11.5 The Digital Signature Algorithm (DSA)

13. 11.6 One-time digital signatures

14. 11.6 One-time digital signatures

15. 11.6 One-time digital signatures

16. 11.6 One-time digital signatures

17. 11.6 One-time digital signatures

18. 11.6 One-time digital signatures

19. 11.7 Other signature schemes

20. 11.7 Other signature schemes

21. 11.8 Signatures with additional functionality

22. 11.8 Signatures with additional functionality

23. 11.8 Signatures with additional functionality

24. 11.8 Signatures with additional functionality