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Digital signature and
  its use in business
         PODPISANI.PL
Agenda

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




              Źródło: Unizeto Technologies S.A.
Theory
• Confidentiality – data security
  against unauthorized access
• Integrity – data security against
  changes
• Authenticity – proof of the origin
Digital signature

Digital signature =
• Keys
   • Public
   • Private
• Certificate
Digital signature –keys
• Private key =
  1276419276529216412731064912412784162
  45120341y6298341602452893461093712423
  5416543128548320573404712835610823059
  8394612563489673931269482365026432187
  9542386412892351925423056342096123851
  3287412874532985634056340956238541287
  4192452305673409641283521874314523056
  1280371209387102937102937126412531892
  6412564198634129541293198215735128321
Private key = public key-1?
Operation with keys
Private key belongs to me.
It’s mine! My precious!
Public key belongs to me,
but everyone has access to
it
Questions?
Something about… confidentiality

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

                      Ola has a cat

                  WTF?!
Trusted Third Party
      TTP
Trusted Third Party – getting keys
   Registration               certification center
     place                            TTP
                  Document
                   transfer




   Proposal,
                                        Repository
   agreement




                              Źródło:
Why trust?



             ?
Certificate




              You can use it to:
              •Sign your e-mail
              •Computer access
              •Secure your software
              •Make proof of your
              identity
What the signature are?
We sign a message? No. We sign a
hash.

Calculation of a sign from a very large message is time-consuming.

So…
Summary




          Źródło: wikipedia.org
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