Contact

National Security Systems Authority maintains this reference directory as a public-facing resource for professionals, researchers, and service seekers operating within the national security systems and cybersecurity sector. This page outlines how correspondence is handled, what types of inquiries fall within scope, and the geographic and subject-matter boundaries of the directory's coverage. Requests submitted outside those boundaries are not processed through this office.

Response expectations

Correspondence received through this directory is reviewed against a defined scope of relevance before any response is issued. The directory covers the cybersecurity and national security systems sector at a national (United States) scale, with a primary focus on provider listings, regulatory alignment, and professional qualification frameworks.

Response timelines vary by inquiry category:

1. Listing inquiries — Requests from organizations seeking inclusion in the Security Systems Listings directory are reviewed on a rolling basis. Initial acknowledgment is issued as processing allows of receipt.
2. Factual or reference corrections — Corrections to published content, including regulatory citations, agency names, or classification details, are prioritized. Documented corrections citing a named public source — such as a NIST publication, a CISA advisory, or a published federal statute — are reviewed as processing allows.
3. Research and data requests — Inquiries from journalists, academic researchers, or policy analysts requesting structural data about the directory or its coverage methodology are handled separately from operational inquiries. These are not guaranteed a response but are reviewed for scope relevance.
4. General public inquiries — Questions of a general informational nature are not individually answered. The Security Systems Directory Purpose and Scope page addresses the most common structural questions about how this resource is organized.

Inquiries requesting legal interpretation, professional advice, or regulatory guidance are outside the scope of this office. The directory publishes reference information — it does not provide compliance counsel. Federal regulatory authority over national security systems rests with bodies including the Committee on National Security Systems (CNSS), the National Security Agency (NSA), and the Cybersecurity and Infrastructure Security Agency (CISA).

Additional contact options

For matters that fall outside direct correspondence with this directory, the following public-sector channels cover adjacent areas of regulatory and operational relevance within the national security systems sector.

Regulatory and standards bodies:

• CISA (Cybersecurity and Infrastructure Security Agency) — Primary federal agency for cybersecurity coordination across critical infrastructure. CISA maintains public contact channels at cisa.gov for incident reporting, sector coordination, and stakeholder engagement.
• NIST Computer Security Resource Center — NIST's CSRC (csrc.nist.gov) manages public comment processes for FIPS publications and Special Publications, including SP 800-series documents governing cybersecurity controls.
• NSA Cybersecurity Directorate — For matters involving national security systems as defined under CNSSI 4009, the NSA Cybersecurity Directorate (nsa.gov/cybersecurity) maintains public-facing resources and coordinates with cleared sector partners.
• CNSS Secretariat — The Committee on National Security Systems, which publishes binding policy for federal national security systems, operates through a secretariat housed at NSA. CNSS issuances are catalogued publicly and govern system classification boundaries under CNSSP No. 11 and related directives.

Contrast between directory scope and regulatory jurisdiction: This directory is a reference resource — it classifies and lists providers operating within the national security systems and cybersecurity sector. Regulatory bodies listed above hold statutory or executive authority over compliance, certification, and enforcement. The two functions are structurally distinct. Providers appearing in this directory are not thereby certified, endorsed, or approved by any federal agency.

How to reach this office

Correspondence directed to National Security Systems Authority should be submitted through the contact form available on this domain. To ensure routing to the appropriate review process, submissions should include:

• The specific page or listing to which the inquiry relates
• The nature of the request (correction, listing inquiry, research request)
• A named public source for any factual correction submitted

Submissions lacking a defined subject or scope classification are deprioritized. Anonymous submissions are accepted but cannot receive a direct response.

Postal correspondence is not processed by this office. All operational communication is handled through digital channels only.

Service area covered

This directory operates at national scope within the United States. Coverage encompasses the full range of cybersecurity and national security systems service providers, vendors, and professional categories operating under federal regulatory frameworks — including but not limited to those subject to FISMA (44 U.S.C. § 3551 et seq.), the CNSS policy framework, and NIST SP 800-53 control families.

Scope boundaries by category:

The How to Use This Security Systems Resource page details the classification methodology applied to listings and the professional qualification standards used to assess provider categories within the directory. Providers operating across 2 or more of the classified system categories — such as firms holding both CMMC certification eligibility and NSA Commercial Solutions for Classified (CSfC) component approvals — may appear under multiple classification headings within the Security Systems Listings.