1. Digital signature and
its use in business
PODPISANI.PL

2. Agenda
• Application of digital signature
• Some primary theory
• Polish digital signature act
• Digital signature in business

3. Application
Źródło: Unizeto Technologies S.A.

4. Theory
• Confidentiality – data security
against unauthorized access
• Integrity – data security against
changes
• Authenticity – proof of the origin

5. Digital signature
Digital signature =
• Keys
• Public
• Private
• Certificate

6. Digital signature –keys
• Private key =
1276419276529216412731064912412784162
45120341y6298341602452893461093712423
5416543128548320573404712835610823059
8394612563489673931269482365026432187
9542386412892351925423056342096123851
3287412874532985634056340956238541287
4192452305673409641283521874314523056
1280371209387102937102937126412531892
6412564198634129541293198215735128321

7. Private key = public key-1?

8. Operation with keys

9. Private key belongs to me.
It’s mine! My precious!
Public key belongs to me,
but everyone has access to
it

10. Questions?

11. Something about… confidentiality
Give me your bank account number
and I will send you 100 000$

12. Something about… Authenticity
Ola has a cat
WTF?!

13. Trusted Third Party
TTP

14. Trusted Third Party – getting keys
Registration certification center
place TTP
Document
transfer
Proposal,
Repository
agreement
Źródło:

15. Why trust?
?

16. Certificate
You can use it to:
•Sign your e-mail
•Computer access
•Secure your software
•Make proof of your
identity

17. What the signature are?

18. We sign a message? No. We sign a
hash.
Calculation of a sign from a very large message is time-consuming.
So…

19. Summary
Źródło: wikipedia.org