--- url: 'https://www.corbado.com/glossary/qualified-certificate' title: 'Qualified Certificate (QC)' description: 'Learn what a Qualified Certificate (QC) is, its key role in secure digital transactions, benefits under eIDAS, and why it matters for digital trust in the EU.' lang: 'en' keywords: 'Qualified Certificate' --- # Qualified Certificate (QC) ## What is a QC (Qualified Certificate)? A **Qualified Certificate (QC)** is a [digital certificate](https://www.corbado.com/glossary/digital-badge) issued by a Qualified Trust Service Provider (QTSP), verifying the identity of an individual or an organization in online transactions, and recognized across the European Union under the [eIDAS](https://www.corbado.com/glossary/eidas) regulation. Important points about Qualified Certificates (QC): - **Legally binding:** Provides strong legal evidence of identity in digital interactions. - **Issued by certified providers:** Only authorized [QTSPs](https://www.corbado.com/glossary/qtsp) can issue QCs, ensuring trust and reliability. - **Used in digital signatures:** QCs underpin Qualified Electronic Signatures (QES), making electronic signatures legally equivalent to handwritten signatures across the EU. - **Enhanced security:** Utilizes advanced cryptographic methods, ensuring authenticity, integrity, and non-repudiation. Qualified Certificates are essential in various use-cases, including e-[government](https://www.corbado.com/passkeys-for-public-sector) services, electronic contracts, and financial transactions, offering users secure and legally robust online interactions. > **Key Takeaways:** > > - A **Qualified Certificate (QC)** is a legally valid > [digital certificate](https://www.corbado.com/glossary/digital-badge) verifying identities online under the > [eIDAS](https://www.corbado.com/glossary/eidas) regulation. > - Issued exclusively by certified Qualified Trust Service Providers (QTSPs). > - Essential for creating Qualified Electronic Signatures (QES), enabling secure and > legally binding digital transactions. --- ## How Qualified Certificates (QC) Work Qualified Certificates (QC) provide a reliable method of [identity verification](https://www.corbado.com/blog/digital-identity-guide) in the digital realm. Issued by authorized Qualified Trust Service Providers (QTSPs), QCs include detailed information verifying an individual's or entity’s identity, ensuring trustworthiness in digital interactions. ## Technical Foundations QCs are built upon robust technical standards and cryptographic mechanisms: - **Public-Key Infrastructure (PKI)**: QCs leverage PKI, involving pairs of cryptographic keys (public and private), ensuring secure identification and non-repudiation. - **Digital Signatures**: With a QC, individuals can create Qualified Electronic Signatures (QES), making digital documents legally binding across the EU. - **Secure Hardware Storage**: Typically, QCs and corresponding private keys are stored securely on cryptographic hardware tokens, like smart cards or Hardware Security Modules (HSMs), preventing unauthorized access. ## Regulatory Background: eIDAS The EU’s [eIDAS](https://www.corbado.com/glossary/eidas) (electronic Identification, Authentication, and Trust Services) regulation establishes a standardized framework for electronic transactions and [digital identity](https://www.corbado.com/blog/digital-identity-guide) verification. Within this framework, QCs are integral, providing a common standard for trusted online identities and digital signatures recognized throughout Europe. ## Benefits of Using Qualified Certificates (QC) - **Legal Certainty**: Digital signatures created with QCs have the same legal validity as handwritten signatures, significantly simplifying digital business processes. - **Cross-Border Recognition**: A QC issued by any EU member state is automatically recognized in all other member states, facilitating seamless cross-border transactions. - **Enhanced Security and Fraud Prevention**: QCs provide robust cryptographic proof of identity, significantly reducing the risk of fraud, identity theft, and document tampering. ## Real-world Applications - **Financial Transactions**: Banks and financial institutions rely on QCs for secure authentication and legally binding electronic transactions. - **E-Government Services**: Citizens and businesses utilize QCs to securely interact with [government](https://www.corbado.com/passkeys-for-public-sector) services, file taxes, sign documents electronically, and access sensitive personal records. - **Business Contracts**: Companies across sectors increasingly use QCs to finalize contracts electronically, improving efficiency and reducing paperwork. By integrating Qualified Certificates into their digital workflows, organizations not only strengthen security but also enhance [user trust](https://www.corbado.com/faq/fallback-management-user-trust-passkey-retention) and compliance with legal standards. ## QC FAQs ### What does QC stand for? QC stands for Qualified Certificate, a legally recognized [digital identity](https://www.corbado.com/blog/digital-identity-guide) certificate issued by authorized providers under EU eIDAS regulations. ### Who can issue a Qualified Certificate (QC)? Only Qualified Trust Service Providers (QTSPs), officially accredited under EU eIDAS regulation, are authorized to issue Qualified Certificates. ### What is the main purpose of a Qualified Certificate? The primary purpose of a QC is to securely and legally verify an individual's or organization’s identity in digital transactions and electronic signatures, ensuring legal certainty. ### Is a digital signature created with a QC legally binding? Yes, a digital signature created using a QC (known as a [Qualified Electronic Signature](https://www.corbado.com/glossary/qualified-electronic-signature), or QES) is legally equivalent to a handwritten signature in all EU member states. ### Where are Qualified Certificates used most often? Qualified Certificates are commonly used in electronic contracts, financial transactions, online [government](https://www.corbado.com/passkeys-for-public-sector) services, and any digital interaction requiring strong [identity verification](https://www.corbado.com/blog/digital-identity-guide) and legal validity.