List of Figures

• Open System Approach.
• POSIX OSE Reference Model.
• Comparison of Architectures.
• X Window System Architecture.
• SQL on a standalone system.
• SQL with remote login.
• SQL with transparent file access.
• SQL with the RDA protocol.
• Packet-filtering-only firewall.
• Dual-homed gateway.
• Choke-gate firewall.
• Screened subnet firewall.
• Message Encryption and Decryption.
• Security Services in a Conventional Cryptosystem.
• Point-to-Point Environment.
• Centralized Management Environment.
• Diffie/Hellman Key Exchange.
• Key Distribution Using a Certification Authority.
• Joint Use of Conventional and Public-key Cryptography.
• MHS Functional Model.
• MHS Message Structure.
• Hierarchical Model for Certification Authorities.
• Structure of an entry.
• Example of the Directory Information Tree.
• Components of the Directory.
• Basic ACL.
• ACL using collective controls.
• A more realistic set of ACLs.
• Allowing both READ and SEARCH.
• Control of SEARCH filter.
• Subtree specifications.
• Subtree levels.
• Example of hybrid scope of influence.
• Example DIT Domain.
• Example of full delegation of authority.
• Example of partial delegation of authority.