CtlSeriesId was previously known as ElectorGroupId. On 30 June 2022, the registry previously known as “ElectorGroupId” was renamed “CtlSeriesId”, with all CtlSeriesId assignments carried forward as ElectorGroupId assignments.

CtlSeriesId: IEEE Std 1609.2.1™

The CtlSeriesId is an identifier specified in IEEE Std 1609.2.1 and used to identify a Certificate Trust List (CTL) series, where each CTL in the series succeeds and updates the information in the previous CTL. A CTL records the list of root Certificate Authority (CA) certificates that are trusted by an SCMS Manager. These root CAs have agreed to follow and enforce the certificate policies and practices of that SCMS Manager. The SCMS Manager also appoints a group of Electors. Each Elector in the group provides a signature on the CTL contents, enabling other participants in the system to trust the CTL.

The CTL also contains information necessary for the perpetuation of future versions of the CTL: the Elector certificates to be used to sign the next CTL in the series, and the “quorum,” which is the minimum number of valid Elector signatures on the next CTL that must be known to any participant in the system for that participant to consider that CTL valid.

The CtlSeriesId is an identifier of the CTL series. It is required to be globally unique and so its allocation is managed by the IEEE RA.

The assignee of an CtlSeriesId is known as the SCMS Manager of that CtlSeriesId.

For more details, see IEEE Std 1609.2.1 or the tutorial on this site.

Registration Fees

Product Fees
IEEE Std 1609.2.1 CtlSeriesId US $745
IEEE does not accept requests for applicant-specified identifiers.

Application Information

Please search our public CtlSeriesId listing to determine whether your company or any parent/subsidiary companies already own an CtlSeriesId assignment. If your Organization has already been issued an assignment, please email us to obtain contact information for the Administrator of the assignment.

  1. Complete and submit the CtlSeriesId application (PDF) by fax or mail. Applications expire after 30 days.
  2. Any questions regarding your application will be sent to the REQUESTOR.
  3. Applications are reviewed within 90 days and additional clarification may be required by our review committee.
  4. Once the application has been approved, it will be processed within 7 business days. Assignment details are sent to the primary applicant upon approval or rejection.

Related Standards

  • This assignment applies to the IEEE 1609.2.1-2020 – IEEE Standard for Wireless Access in Vehicular Environments (WAVE) – Certificate Management Interfaces for End-Entities
  • The application and CtlSeriesId assignees have an obligation and responsibility to manage the assigned CtlSeriesId and to minimize unused CtlSeriesIds.
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