The classification of security services are as follows:
Confidentiality: Ensures that the information in a computer system a n d transmitted
information are accessible only for reading by authorized parties.
E.g. Printing, displaying and other forms of disclosure.
Authentication: Ensures that the origin of a message or electronic document is correctly
identified, with an assurance that the identity is not false.
Integrity: Ensures that only authorized parties are able to modify computer system assets and
transmitted information. Modification includes writing, changing status, deleting, creating
and delaying or replaying of transmitted messages.
Non repudiation: Requires that neither the sender nor the receiver of a message be able to deny
the transmission.
Access control: Requires that access to information resources may be controlled by or the target
system.
Availability: Requires that computer system assets be available to authorized parties when
needed.
