Computer Security Resource Center

Computer Security Resource Center

Computer Security
Resource Center

Glossary

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Availability

Acronym(s):

None

Definition(s):

  Ensuring timely and reliable access to and use of information.
Source(s): FIPS 200 (44 U.S.C., Sec. 3542)
FIPS 199 (44 U.S.C., Sec. 3542)
CNSSI 4009-2015 (44 U.S.C., Sec. 3542)
NIST SP 800-137 (44 U.S.C., Sec. 3542)
NIST SP 800-171 (Updates to version published June 2015) (44 U.S.C., Sec. 3542)
NIST SP 800-18 Rev. 1 (44 U.S.C., Sec. 3542)
NIST SP 800-37 Rev. 1 (44 U.S.C., Sec. 3542)
NIST SP 800-39 (44 U.S.C., Sec. 3542)
NIST SP 800-53 Rev. 4 (44 U.S.C., Sec. 3542)
NIST SP 800-60 Vol 1 Rev. 1 (44 U.S.C., Sec. 3542)
NIST SP 800-30 (44 U.S.C., Sec. 3542)
NIST SP 800-53A Rev. 4 (44 U.S.C., Sec. 3542)

  Timely, reliable access to data and information services for authorized users.
Source(s): CNSSI 4009-2015 (NSA/CSS Manual Number 3-16 (COMSEC))
NIST SP 800-70 Rev. 2

  The ability for authorized users to access systems as needed.
Source(s): NIST SP 800-113

  A requirement intended to assure that systems work promptly and service is not denied to authorized users.
Source(s): NIST SP 800-12 (75)

  Ensuring that information is accessible by authorized users.
Source(s): NIST SP 800-123

  Timely, reliable access to information or a service.
Source(s): NIST SP 800-152

  The timely, reliable access to data and information services for authorized users.
Source(s): NIST SP 800-16

  Timely, reliable access to information by authorized entities.
Source(s): NIST SP 800-21 Second edition (NIST SP 800-57)
NIST SP 800-57 Part 1 Rev. 3
NIST SP 800-57 Part 2
NIST SP 800-57 Part 3 Rev. 1

  The security goal that generates the requirement for protection against intentional or accidental attempts to (1) perform unauthorized deletion of data or (2) otherwise cause a denial of service or data.
Source(s): NIST SP 800-27 Rev. A

  The property that data or information is accessible and usable upon demand by an authorized person.
Source(s): NIST SP 800-66 Rev. 1 (45 C.F.R., Sec. 164.304)

  Ensure that devices and individuals can access a network and its resources whenever needed.
Source(s): NIST SP 800-97

  As defined in FISMA, the term 'availability' means ensuring timely and reliable access to and use of information.
Source(s): NIST SP 800-59 (44 U.S.C., Sec. 3542 (b)(1)(C) )

  The security objective that generates the requirement for protection against intentional or accidental attempts to (1) perform unauthorized deletion of data or (2) otherwise cause a denial of service or data.
Source(s): NIST SP 800-33

Synonym(s):

None

See Also: