PKI : The role of TTP’s for the
Development of secure
Transaction Systems

EPIC
Copyright, 1998 © John Iliadis, University...
Introduction
• Electronic transactions : how safe are
they? Common security threats
• Security schemes and solutions used
...
Overview
• Identification of security threats in
electronic transactions
• Confrontation with security threats
through PKI...
Security threats in electronic
transactions
• monitoring of communication lines
• Non-authorised modification of (in-trans...
Insecure electronic
transactions
Entity1

Network

Entity2

insecure transaction
Confrontation with security
threats through PKI provisions
• monitoring of communication lines
Encryption with randomly ge...
Confrontation with security
threats through PKI provisions
• Masquerade - Web spoofing
Exchange of X509v3 certificates and...
TTP : Securing electronic
transactions
Entity1

Network

Issuing certificates

Entity2

Issuing certificates

TTP
secure t...
TTP : the cornerstone of a Public Key
Infrastructure. A general overview
TTP : “an impartial organisation delivering
busin...
TTP : the cornerstone of a Public Key
Infrastructure. Technical Infrastructure
• Directory Services acting as repositories...
TTP : the cornerstone of a Public Key
Infrastructure. Technical Infrastructure

TTP

RDBMs

local
repository
Backup of
loc...
TTP services and functions
• Electronic Registration
• Key Personalisation, Generation, and Repository
• Certificates: Str...
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PKI : The role of TTPs for the Development of secure Transaction Systems

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Workshop on Software Process Improvement and Formal Methods in Security and Safety, Athens, Greece, March 1998, EPIC Project (Exchanging process information experiences across SMEs by conferencing on the Internet"), 1997-1998, European Commission, ESPRIT Programme

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PKI : The role of TTPs for the Development of secure Transaction Systems

  1. 1. PKI : The role of TTP’s for the Development of secure Transaction Systems EPIC Copyright, 1998 © John Iliadis, University of the Aegean
  2. 2. Introduction • Electronic transactions : how safe are they? Common security threats • Security schemes and solutions used before the development of PKI • The role of PKI in securing transactions. Providing secure transactions in insecure networks
  3. 3. Overview • Identification of security threats in electronic transactions • Confrontation with security threats through PKI provisions • TTP : the cornerstone of a Public Key Infrastructure. A general overview • TTP services and functions
  4. 4. Security threats in electronic transactions • monitoring of communication lines • Non-authorised modification of (in-transit) information • Masquerade - Web spoofing • Password stealing • Unauthorised access • Key personnel and physical insecurity
  5. 5. Insecure electronic transactions Entity1 Network Entity2 insecure transaction
  6. 6. Confrontation with security threats through PKI provisions • monitoring of communication lines Encryption with randomly generated shared session key • shared session key stealing/guessing -cryptographically secure random key generators -encryption of shared session key with the public key of the receiving entity • Non-authorised modification of (in-transit) information secure hashing algorithms for message authentication codes
  7. 7. Confrontation with security threats through PKI provisions • Masquerade - Web spoofing Exchange of X509v3 certificates and verification against a Directory • Password stealing Passwords are never transmitted in the network • Unauthorised access Local ACL. Authentication by certificate verification
  8. 8. TTP : Securing electronic transactions Entity1 Network Issuing certificates Entity2 Issuing certificates TTP secure transaction insecure transaction
  9. 9. TTP : the cornerstone of a Public Key Infrastructure. A general overview TTP : “an impartial organisation delivering business confidence, through commercial and technical security features, to an electronic transaction”
  10. 10. TTP : the cornerstone of a Public Key Infrastructure. Technical Infrastructure • Directory Services acting as repositories of identification and authentication information of the entities participating in the security scheme. • Certificate Servers providing the X.509v3 certificates and thus validating the signatures of the abovementioned entities • Content Servers operating as platforms for the dissemination of data and the remote execution of application. If the network that is used is the Internet, then the content servers are Web Servers. • Network client which provides the capability of accessing the information stored in the content servers, executing remote applications and accept and store certificates for use by the entity. If the network used is the Internet, then the network client is a Web browser
  11. 11. TTP : the cornerstone of a Public Key Infrastructure. Technical Infrastructure TTP RDBMs local repository Backup of local repository Directory Services Web Server Web browser
  12. 12. TTP services and functions • Electronic Registration • Key Personalisation, Generation, and Repository • Certificates: Structure, Generation, Distribution, Storage, and Retrieval • Certificate Directory Management • CRLs: Structure, Generation and Maintenance, Distribution, Storage, and Retrieval • Auditing

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