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Public Key Infrastructure for Digital Signatures. Christian Ploninger Technische Universitaet Wien. Contents. Asymmetric Encryption Key-Person-Binding Problem Public Key Infrastructure - Components - Functionality. Asymmetric Encryption. Authenticity Secrecy Integrity.

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Presentation Transcript
slide1

Public Key Infrastructure

for

Digital Signatures

Christian Ploninger

Technische Universitaet Wien

slide2

Contents

  • Asymmetric Encryption
  • Key-Person-Binding Problem
  • Public Key Infrastructure
    • - Components
    • - Functionality
slide3

Asymmetric Encryption

  • Authenticity
  • Secrecy
  • Integrity
slide5

Key-Person-Binding

  • Certificates
  • Trusted Third Parties
slide6

PKI - Components

  • Local Registration Authority (LRA)
  • Certification Authority (CA)
  • Root Certification Authority (RCA)
slide7

Provide Data

  • Submit Data securely

Applicant

Certification

Authority

Registration

Authority

Hand over Private Key

Publish Certificate

Directory

Service

PKI - Requesting a Certificate

  • Verify User Identity
  • Verify Message Authenticity
  • Create User Key-pair
  • Issue Certificate
  • Sign Certificate
slide8

PKI - Functionality

  • Key Creation for CA
  • User Registration
  • Key Creation for Users
  • Issue Certificates
slide9

PKI - Functionality

  • Directory Service
  • Revoke Certificates
  • Timestamp Service
  • Personalize Private Keys
slide10

Conclusion

  • Asymmetric Encryption is not enough
  • Key-Person-Binding Problem
  • PKI solves this problem
slide11

Recommended Readings

  • Security in Open Networks,

Dusemund, Becker, Gollan, Engel and Meinel,

http://www.ti.fhg.de/publikationen/technische_berichte/2000/prep1500.de.ps

  • Ten Risks of PKI,

Carl Ellison and Bruce Schneier,

http://www.counterpane.com/pki-risks.pdf

  • Digitale Signatur,

Frank Bitzer and Klaus Brisch,

Springer Verlag, ISBN 3-540-65563-8