• ITU-T provides some security services and some mechanisms to implement those services.
  • Security services and mechanisms are closely related because a mechanism or combination of mechanisms are used to provide a service..

Security services

  • Authentication: assures recipient that the message is from the source that it claims to be from. 
  • Access Control: controls who can have access to resource under what condition
  • Availability: available to authorized entities for 24/7. 
  • Confidentiality: information is not made available to unauthorized individual
  • Integrity: assurance that the message is unaltered
  • Non-Repudiation: protection against denial of sending or receiving in the communication

Security Mechanisms

Relation between security services and mechanisms