# SC-45 System Time Synchronization

NIST SP 800-53 control. Family: SC System and Communications Protection. Function: preventative. In no baseline. Mapping licence: CC BY-SA 4.0.

Statement: Synchronize system clocks within and between systems and system components.
Guidance: Time synchronization of system clocks is essential for the correct execution of many system services, including identification and authentication processes that involve certificates and time-of-day restrictions as part of access control. Denial of service or failure to deny expired credentials may result without properly synchronized clocks within and between systems and system components. Time is commonly expressed in Coordinated Universal Time (UTC), a modern continuation of Greenwich Mean Time (GMT), or local time with an offset from UTC. The granularity of time measurements refers to the degree of synchronization between system clocks and reference clocks, such as clocks synchronizing within hundreds of milliseconds or tens of milliseconds. Organizations may define different time granularities for system components. Time service can be critical to other security capabilities—such as access control and identification and authentication—depending on the nature of the mechanisms used to support the capabilities.

## Enhancements (2)
- SC-45(01) Synchronization with Authoritative Time Source
- SC-45(02) Secondary Authoritative Time Source
Each enhancement's statement: /api/v1/controls/SC-45?fields=enhancements

## Patterns that use it (1)
- Important (1): SP-054 CBDC and Digital Currency Infrastructure (draft)

## Clauses by framework (15 frameworks)
- iso_27002_2022: 8.17
- pci_dss_v4: 10.6
- cis_controls_v8: CIS 8, CIS 8.4
- soc2_tsc: CC7.1, CC7.2
- iec_62443: 3-3 SR 2.11
- apra_cps_234: Para 22-23
- mas_trm: 14
- osfi_b13: B-13.3.3
- bio2: 8.17
- rbi_csf: Annex1.17
- hkma_tme1: TME1.5.2
- nca_ecc: 2-12
- bom_ctrm: 3.13
- bot_cyber: Ch9.1
- nrc_73_54: RG5.71-A-SC

## More
- This control as JSON, with guidance and ATT&CK techniques: /api/v1/controls/SC-45
- Clauses only: /api/v1/controls/SC-45?fields=mappings
- Page for people: /controls/sc-45/
- Found an error? Open an issue at https://github.com/opensecurityarchitecture/osa-data/issues with the id, what OSA says and what the source says.