Perform testing using hardware or simulation/emulation where the test executes over a long period of time (30+ days). This testing will attempt to flesh out race conditions or time-based attacks.
| ID | Name | Description | |
| EX-0008 | Time Synchronized Execution | Threat actors may develop payloads or insert malicious logic to be executed at a specific time. | |
| .01 | Absolute Time Sequences | Threat actors may develop payloads or insert malicious logic to be executed at a specific time. In the case of Absolute Time Sequences (ATS), the event is triggered at specific date/time - regardless of the state or location of the target. | |
| .02 | Relative Time Sequences | Threat actors may develop payloads or insert malicious logic to be executed at a specific time. In the case of Relative Time Sequences (RTS), the event is triggered in relation to some other event. For example, a specific amount of time after boot. | |
| ID | Description |
| SV-AV-2 | Satellites base many operations on timing especially since many operations are automated. Cyberattack to disrupt timing/timers could affect the vehicle (Time Jamming / Time Spoofing) |
| SV-AV-8 | Clock synchronization attack for Spacewire. Since terminals in a distributed system are driven by independent clocks, the clock sync performance is one of the most important indexes in a networked system. |
| Requirement | Rationale/Additional Guidance/Notes |
|---|---|
| The [spacecraft] shall synchronize the internal system clocks for each processor to the authoritative time source when the time difference is greater than the FSW-defined interval.{SV-AV-2}{AU-8(1),SC-45,SC-45(1),SC-45(2)} | |
| If Spacewire is utilized, the [spacecraft] shall adhere to [organization]-defined time synchronization standard/protocol to synchronize time across a Spacewire network with an accuracy around 1 microsecond.{SV-AV-8}{SC-45,SC-45(1),SC-45(2)} | Example for time synchronization is Time Distribution Protocol (http://spacewire.esa.int/WG/Spacewire/SpW-WG-Mtg17-Proceedings/Documents/ISC_2011%20CCSDS%20Time%20Distribution%20over%20SpaceWire.pdf & https://amstel.estec.esa.int/tecedm/ipcores/time_sync_protocol.pdf). These activities by ESA are looking to perform standardization of a time distribution protocol, synchronization, and handling of latency, jitter, and drift |