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Public Key Infrastructure for Digital Signatures

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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Public Key Infrastructure for Digital Signatures

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  1. Public Key Infrastructure for Digital Signatures Christian Ploninger Technische Universitaet Wien

  2. Contents • Asymmetric Encryption • Key-Person-Binding Problem • Public Key Infrastructure • - Components • - Functionality

  3. Asymmetric Encryption • Authenticity • Secrecy • Integrity

  4. Asymmetric Encryption

  5. Key-Person-Binding • Certificates • Trusted Third Parties

  6. PKI - Components • Local Registration Authority (LRA) • Certification Authority (CA) • Root Certification Authority (RCA)

  7. 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

  8. PKI - Functionality • Key Creation for CA • User Registration • Key Creation for Users • Issue Certificates

  9. PKI - Functionality • Directory Service • Revoke Certificates • Timestamp Service • Personalize Private Keys

  10. Conclusion • Asymmetric Encryption is not enough • Key-Person-Binding Problem • PKI solves this problem

  11. 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

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