CISO Tribune

Vendor comparison · 2 companies

DigiCert vs QuSecure

DigiCert ONE is a platform that includes Trust Lifecycle Manager for organizations that require CA-agnostic certificate lifecycle management. QuSecure is a post-quantum cryptography and crypto-agility company that gives an enterprise one place to set and enforce cryptographic policy across its infrastructure. CISO Tribune files both under Post-quantum cryptography. This page sets the two records side by side: what each sells, where it is based, who owns and funds it, the customers it names and its recent news, each fact numbered to its source.

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  • DigiCert
  • QuSecure
DigiCert vs QuSecure: Products, Customers and Funding Compared
DigiCertDigiCert ONE is a platform that includes Trust Lifecycle Manager for organizations that require CA-agnostic certificate lifecycle management.digicert.comQuSecureQuSecure is a post-quantum cryptography and crypto-agility company that gives an enterprise one place to set and enforce cryptographic policy across its infrastructure.qusecure.com
What it sells
  • AI Trust Manager[1][8]Helps organizations discover, secure, and govern AI agents, AI models, and MCP servers.
  • CertCentral[1][3]Used to order and administer DigiCert certificates.
  • Private CA[1][7]DigiCert's Private CA solutions are pointed to strictly internal use cases.
  • DigiCert X9 PKI[7]A dedicated public key infrastructure for interoperability and flexibility for non-web browsers.
  • QuProtect R3[7][9][10]Platform for cryptographic command and control.
  • QuProtect[1][3][4][7][9][10][11][12][13]Post-quantum cybersecurity software for protecting encrypted communications and data.
  • QuEverywhere[13]Quantum-safe cryptography orchestration for websites and mobile applications.
Categories
Headquarters
Not stated on its pagesSan Mateo, United States[2]
Founded
Not stated on its pagesNot stated on its pages
Ownership and funding
Not stated on its pagesPrivately held[2][13]
Named customers
Not stated on its pagesNot stated on its pages
Recent news
  • September 24, 2026DigiCert announced general availability of Quantum Central, a DigiCert ONE platform offering that helps organizations manage progress toward post-quantum cryptography readiness.[12]
  • September 22, 2026QuSecure announced it was named a Cool Vendor in a Gartner report on data security innovations, recognizing its post-quantum cryptography solution.[6]
  • February 11, 2026QuSecure appointed Brian Cunningham as Executive Vice President, Strategy and Growth, as enterprises and government agencies move to post-quantum cryptography.[15]
  • February 11, 2026QuSecure appointed Brian Cunningham, a former Special Operations Commander and Navy SEAL, as EVP Strategy & Growth.[5]
G2 and Gartner Peer Insights
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
  • G2: Not stated on its pages
  • Gartner Peer Insights: Not stated on its pages
Who it fits
X9 PKI is aimed at host-to-host communications (mTLS) involving multiple organizations. DigiCert issues ZertES certificates for organizations and individuals that require legally recognized digital trust under Swiss law. Trust Lifecycle Manager is described for organizations that require CA-agnostic certificate lifecycle management. DigiCert AI Trust Manager is described for organizations that need to discover, secure, and govern AI agents, AI models, and MCP servers. CertCentral Europe is hosted in European data centers for customers with data residency and sovereignty requirements.From its own pages, the company directs QuProtect at commercial and federal channel partners. The stated aim is to let those partners secure their networks, communication, and data. The site also carries industry pages for financial services, insurance, energy and grid, hospital systems, manufacturing, pharma and life sciences, and state and local government. This is our reading of the pages, and they state no organisation sizes or buyer roles.
Last verified
November 5, 2026September 27, 2026

Where they overlap

  • DigiCert and QuSecure are both filed under Post-quantum cryptography.

Where they differ, field by field

  • DigiCert's primary category is Machine identity and PKI; QuSecure's is Post-quantum cryptography.
  • DigiCert is also filed under DNS security and Email authentication and DMARC. QuSecure is also filed under Encryption, tokenization and key management.
  • DigiCert lists AI Trust Manager, CertCentral, Private CA and DigiCert X9 PKI. QuSecure lists QuProtect R3, QuProtect and QuEverywhere.
  • QuSecure is headquartered in San Mateo, United States.
  • QuSecure is privately held.

What it sells: DigiCert

What AI Trust Manager does[1][8]
DigiCert AI Trust Manager assigns each AI agent a cryptographically verifiable AI Agent Passport linked to its organizational and human ownership. DigiCert AI Trust Manager verifies AI model integrity from development through deployment and runtime. DigiCert AI Trust Manager protects AI agents, AI models, and MCP servers, as well as the systems, tools, and data they access.
What CertCentral does[1][3]
DigiCert certificates can be ordered and administered through CertCentral Europe. CertCentral Europe is hosted in European data centers to address data residency and sovereignty requirements. CertCentral Europe is part of the DigiCert ONE platform.
What DigiCert X9 PKI does[7]
DigiCert X9 PKI is a dedicated public key infrastructure designed to provide interoperability and flexibility for non-web browsers. DigiCert X9 PKI operations are governed by an ASC X9 Policy Committee and undergo an annual independent WebTrust audit. Organizations with existing PKI systems can cross-certify with the X9 PKI root. The X9 PKI is intended for non-browser TLS authentication scenarios.

What it sells: QuSecure

What QuProtect R3 does[7][9][10]
QuProtect R3 delivers continuous cryptographic inventory, remediation to TLS 1.3 with ML-KEM, automated certificate rotation, and compliance evidence. QuProtect R3 enables security teams to swap algorithms and push cryptographic policy changes across their entire network from one place. QuProtect R3 operates across cloud, on-premises, air-gapped, and sovereign environments and is backwards compatible with legacy infrastructure.
What QuProtect does[1][3][4][7][9][10][11][12][13]
QuProtect is a software-based PQC solution designed to protect encrypted communications and data using quantum secure channels. QuProtect is compatible with all algorithms selected by NIST. QuProtect provides authentication of users, devices, data, and services. QuProtect protects data in transit in datacenters and in the cloud.
What QuEverywhere does[13]
QuEverywhere is a quantum-safe cryptography orchestration product launched by QuSecure. QuEverywhere protects encrypted private data on any website or mobile application with quantum-resilient connections and sessions. QuSecure states that organizations can protect sensitive data wherever it travels without installing software at the endpoint.

Questions about DigiCert and QuSecure

What do DigiCert and QuSecure sell?
DigiCert sells AI Trust Manager, CertCentral, Private CA and DigiCert X9 PKI. QuSecure sells QuProtect R3, QuProtect and QuEverywhere.
Are DigiCert and QuSecure in the same category?
They share Post-quantum cryptography. DigiCert's primary category is Machine identity and PKI and QuSecure's is Post-quantum cryptography.
Where are DigiCert and QuSecure headquartered?
QuSecure is headquartered in San Mateo, United States.
Who owns DigiCert and QuSecure?
QuSecure is privately held.
Who are DigiCert and QuSecure sold to?
X9 PKI is aimed at host-to-host communications (mTLS) involving multiple organizations. From its own pages, the company directs QuProtect at commercial and federal channel partners.
What have DigiCert and QuSecure announced recently?
September 24, 2026: DigiCert announced general availability of Quantum Central, a DigiCert ONE platform offering that helps organizations manage progress toward post-quantum cryptography readiness. September 22, 2026: QuSecure announced it was named a Cool Vendor in a Gartner report on data security innovations, recognizing its post-quantum cryptography solution.

About DigiCert

DigiCert ONE is a platform that includes Trust Lifecycle Manager for organizations that require CA-agnostic certificate lifecycle management. CertCentral Europe is part of the DigiCert ONE platform. DigiCert ONE is available to customers from global regions including European, Australia, India, Japan, and the United States.[3]

DigiCert certificates can be ordered and administered through CertCentral Europe, which is hosted in European data centers to address data residency and sovereignty requirements. DigiCert signs all SSL certificates using the SHA-256 Algorithm. DigiCert assigns an alphanumeric serial number to each SSL certificate it issues. DigiCert offers identity-validated S/MIME for encryption, signing, and phishing protection. DigiCert describes protecting code signing for software releases.[2][3][4]

Verified Mark Certificates (VMCs) from DigiCert enable organizations to display their registered trademark logo in supported email clients. The BIMI standard requires organizations to have a logo that is a registered trademark so that they can be issued a VMC. DigiCert validates an organization's legal existence and confirms its control over the domain associated with the VMC request using Extended Validation (EV) standards. For a VMC, DigiCert performs additional validation beyond the standard Extended Validation (EV) certificate process. DigiCert validates that the SVG logo complies with BIMI requirements and exactly matches the registered trademark. The individual requesting a VMC must be verified as an authorized representative of the organization. Once approved, DigiCert issues the Verified Mark Certificate.[5][6]

DigiCert X9 PKI is a dedicated public key infrastructure designed to provide interoperability and flexibility for non-web browsers. DigiCert X9 PKI operations are governed by an ASC X9 Policy Committee and undergo an annual independent WebTrust audit. X9 PKI was born from the financial services industry’s need for a dedicated, interoperable trust framework. The X9 PKI is intended for non-browser TLS authentication scenarios. Its main use case at the outset is mutual TLS (mTLS) among financial institutions and between them and their partners and customers. Organizations with existing PKI systems can cross-certify with the X9 PKI root. DTCC will require X9 PKI certificates for securing connections to IBM MQ, Connect:Direct, and FTPS.

DigiCert is a Qualified Trust Service Provider issuing digital certificates under EU and national trust frameworks, including eIDAS, PKIoverheid (Netherlands), and ZertES (Switzerland). DigiCert issues eIDAS qualified certificates, and the available certificate types include QWACs for PSD2, as well as qualified electronic signatures, seals, and timestamps. DigiCert issues PKIoverheid qualified certificates for personal organizations, professionals, and citizens. DigiCert issues ZertES certificates for organizations and individuals that require legally recognized digital trust under Swiss law. ZertES certificates support qualified and regulated electronic signatures, electronic seals, and qualified timestamps.[3]

DigiCert AI Trust Manager helps organizations discover, secure, and govern AI agents, AI models, and MCP servers. DigiCert AI Trust Manager assigns each AI agent a cryptographically verifiable AI Agent Passport linked to its organizational and human ownership. DigiCert AI Trust Manager verifies AI model integrity from development through deployment and runtime. DigiCert AI Trust Manager protects AI agents, AI models, and MCP servers, as well as the systems, tools, and data they access. DigiCert describes automating passport revocation to enable a real-time kill switch for agentic sessions.[8]

DigiCert says replacing cryptography across systems, software, and devices is a multi-year effort that requires planning, testing, and coordination. DigiCert describes inventorying certificates, keys, endpoints, and libraries across PKI and beyond. DigiCert describes standardizing certificate issuance across disparate certificate authorities. DigiCert offers PQC-ready solutions for digital signatures, PKI, and certificate lifecycle management. DigiCert is active in CA/B Forum, IETF, ETSI, and C2PA. For connected devices, DigiCert describes giving every device a verifiable identity from deployment to retirement. For workloads, DigiCert describes making each workload, API, and container prove its identity. For digital content, DigiCert describes verifying that all digital content is authentic and unaltered.[2][8][9][10][11]

DigiCert on the record

Sources

DigiCert full record

  1. [1]digicert.comDigiCert · digicert.com · undated page, accessed November 5, 2026 · Tier A
  2. [2]TLS/SSL Certificate Authority | Leader in Digital Trust | DigiCertDigiCert · undated page, accessed November 10, 2026 · Tier A
  3. [3]Solutions for the European UnionDigiCert · undated page, accessed November 10, 2026 · Tier A
  4. [4]What extensions and details are included in a SSL certificate?DigiCert · undated page, accessed November 10, 2026 · Tier A
  5. [5]VMC | New validation stepsDigiCert · undated page, accessed November 10, 2026 · Tier A
  6. [6]How to trademark your logo for VMCDigiCert · undated page, accessed November 10, 2026 · Tier A
  7. [7]DigiCert X9 PKI | DigiCertDigiCert · undated page, accessed November 10, 2026 · Tier A
  8. [8]AI Trust Manager | Cryptographic trust for AI | DigiCertDigiCert · undated page, accessed November 10, 2026 · Tier A
  9. [9]Post-Quantum Cryptography Solutions & PQC Readiness | DigiCertDigiCert · undated page, accessed November 10, 2026 · Tier A
  10. [10]Why DigiCert | Unified Digital Trust Leader | DigiCertDigiCert · undated page, accessed November 10, 2026 · Tier A
  11. [11]Trust Calendar: Public Trust & Compliance Changes | DigiCertDigiCert · undated page, accessed November 10, 2026 · Tier A
  12. [12]DigiCert Quantum Central Now Available to Help Organizations Turn PQC Plans into ActionDigiCert · published September 24, 2026 · Tier A

QuSecure full record

  1. [1]qusecure.comQuSecure · qusecure.com · undated page, accessed September 27, 2026 · Tier A
  2. [2]Accenture invests in qusecure to protect against future quantum threats with crypto agilityAccenture · newsroom.accenture.com · published January 22, 2025 · Tier B
  3. [3]MSSP Alert: Arrow Electronics, QuSecure Partner for Post-Quantum CybersecurityMSSP Alert · published January 26, 2023 · Tier A
  4. [4]Crypto-Agility for Critical Systems | QuSecureQuSecure · undated page, accessed October 27, 2026 · Tier A
  5. [5]QuSecure Appoints Brian Cunningham as EVP Strategy & Growth to Scale Federal and Commercial Adoption of Post-Quantum SecurityBusiness Wire · published February 11, 2026 · Tier A
  6. [6]QuSecure Recognized in the Gartner® Coolest Vendor Innovations in Data Security Report for its Post-Quantum Cryptography SolutionBusiness Wire · published September 22, 2026 · Tier A
  7. [7]QuSecure Awarded Follow-On U.S. Air Force Contract for Post-Quantum Cybersecurity Solutions to Strengthen National DefenseQuSecure · published January 8, 2025 · Tier A
  8. [8]About QuSecure | The Company Leading Crypto-AgilityQuSecure · undated page, accessed November 10, 2026 · Tier A
  9. [9]QuSecure Named a Gartner Cool Vendor in Data Security | QuSecureQuSecure · published September 22, 2026 · Tier A
  10. [10]QuSecure on 3 Ways to Accelerate Your Quantum SecurityQuSecure · undated page, accessed November 10, 2026 · Tier A
  11. [11]NIST Addressing Future Post-Quantum Cybersecurity Threats Today | QuSecureAmerican Security Today · published July 6, 2022 · Tier A
  12. [12]Arrow Electronics Signs Agreement with US-based Company | QuSecureGEO SPATIAL WORLD · published January 27, 2023 · Tier A
  13. [13]QuSecure Achieves Post-Quantum Encryption BreakthroughQuSecure · published January 18, 2023 · Tier A
  14. [14]Be Quantum Safe while Achieving HR 7535 Compliance with QuSecure | QuSecureQuSecure · undated page, accessed November 10, 2026 · Tier A
  15. [15]QuSecure Appoints Brian Cunningham as EVP Strategy & Growth to Scale Federal and Commercial Adoption of Post-Quantum SecurityQuSecure Inc. · published February 11, 2026 · Tier A

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