SC-45(1)

Requirement
1. Compare the internal system clocks [Assignment: organization-defined frequency] with [Assignment: organization-defined authoritative time source]; and
2. Synchronize the internal system clocks to the authoritative time source when the time difference is greater than [Assignment: organization-defined time period].

Discussion

Synchronization of internal system clocks with an authoritative source provides uniformity of time stamps for systems with multiple system clocks and systems connected over a network.

Title

System Time Synchronization | Synchronization with Authoritative Time Source
Family

System and Communications Protection
NIST 800-53B Baseline(s)

NIST 800-53A Assessment Guidance

Examine

[SELECT FROM: System and communications protection policy; procedures addressing time synchronization; system design documentation; system configuration settings and associated documentation; system audit records; system security plan; other relevant documents or records].

Interview

[SELECT FROM: System/network administrators; organizational personnel with information security responsibilities; organizational personnel installing, configuring, and/or maintaining the system].

Test

[SELECT FROM: Mechanisms supporting and/or implementing system time synchronization].

ID	Assessment Objectives
SC-45(01)(a)	the internal system clocks are compared <SC-45(01)_ODP[01] frequency> with <SC-45(01)_ODP[02] authoritative time source>;
SC-45(01)(b)	the internal system clocks are synchronized with the authoritative time source when the time difference is greater than <SC-45(01)_ODP[03] time period>.

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