ISO security architecture

The ISO OSI (open systems interconnect) seven-layer model of distributed systems is well known and is repeated in this figure:

iso

What is less well known is that ISO built a whole series of documents upon this architecture. For our purposes here, the most important is the ISO Security Architecture model, ISO 7498-2.

Functions and levels

The principal functions required of a security system are

  • Authentication - proof of identity
  • Data integrity - data is not tampered with
  • Confidentiality - data is not exposed to others
  • Notarization/signature
  • Access control
  • Assurance/availability

These are required at the following levels of the OSI stack:

  • Peer entity authentication (3, 4, 7)
  • Data origin authentication (3, 4, 7)
  • Access control service (3, 4, 7)
  • Connection confidentiality (1, 2, 3, 4, 6, 7)
  • Connectionless confidentiality (1, 2, 3, 4, 6, 7)
  • Selective field confidentiality (6, 7)
  • Traffic flow confidentiality (1, 3, 7)
  • Connection integrity with recovery (4, 7)
  • Connection integrity without recovery (4, 7)
  • Connection integrity selective field (7)
  • Connectionless integrity selective field (7)
  • Non-repudiation at origin (7)
  • Non-repudiation of receipt (7)

Mechanisms

  • Peer entity authentication
    • encryption
    • digital signature
    • authentication exchange
  • Data origin authentication
    • encryption
    • digital signature
  • Access control service
    • access control lists
    • passwords
    • capabilities lists
    • labels
  • Connection confidentiality
    • encryption
    • routing control
  • Connectionless confidelity
    • encryption
    • routing control
  • Selective field confidelity
    • encryption
  • Traffic flow confidelity
    • encryption
    • traffic padding
    • routing control
  • Connection integrity with recovery
    • encryption
    • data integrity
  • Connection integrity without recovery
    • encryption
    • data integrity
  • Connection integrity selective field
    • encryption
    • data integrity
  • Connectionless integrity
    • encryption
    • digital signature
    • data integrity
  • Connectionless integrity selective field
    • encryption
    • digital signature
    • data integrity
  • Non-repudiation at origin
    • digital signature
    • data integrity
    • notarization
  • Non-repudiation of receipt
    • digital signature
    • data integrity
    • notarization

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