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BackWhat is a Digital Certificate in cybersecurity?
A digital certificate in cybersecurity is an electronic credential that binds a subject, such as a person, device, server, or organization, to a public cryptographic key. A relying system can validate the certificate against an accepted trust anchor and use the certified public key for functions such as authentication, digital signature verification, or secure key establishment.
How does a digital certificate work?
The process generally works as follows:
| Step | Description |
| Generate a key pair | A public and private key pair is created. |
| Request a certificate | Submit a certificate request through a supported enrollment method, which may include a Certificate Signing Request (CSR) or an automated certificate management protocol. |
| Validate the request | The Certificate Authority (CA) or Registration Authority (RA) performs the checks required by its certificate policy, such as validating domain control, organizational information, identity, or possession of the corresponding private key. |
| Issue the certificate | The CA signs and issues a digital certificate containing the public key and subject information. |
| Validate the certificate | A relying system validates the certification path, validity period, intended key usage, subject information, and applicable status information before relying on the public key. |
A digital certificate in cybersecurity does not contain the private key. The private key remains securely stored by the certificate owner.
Digital certificate vs. digital signature
Although closely related, digital certificates and digital signatures serve different purposes.
| Digital certificate | Digital signature |
| Provides a signed binding between a subject identifier and a public key | Verifies data integrity and demonstrates that the signature was created with the corresponding private key |
| May be issued by a public or private CA, or be self-signed | Created using the signer’s private key |
| Contains a public key and certificate information | Produces a cryptographic signature for specific data |
| Supports authentication and trust decisions | Helps verify that signed data has not been altered |
Why are digital certificates in cybersecurity important?
Digital certificates support trusted digital communications by enabling authentication and secure key establishment. Organizations use digital certificates to secure HTTPS, authenticate users and devices, protect email communications, enable VPN connections, support enterprise Wi-Fi authentication, facilitate code signing, and secure other PKI-based services.
Without a reliable authentication mechanism, users and systems may be more vulnerable to impersonation and man-in-the-middle attacks. Organizations use properly validated digital certificates to authenticate communicating entities.
Best practices for certificate management
Organizations should actively manage digital certificates throughout their lifecycle.
Recommended practices include:
- Use certificates that chain to trust anchors accepted by the intended relying systems, whether managed through a reputable public CA or a properly secured private PKI.
- Protect private keys using secure storage or hardware-backed protection where available.
- Monitor certificate expiration dates and renew certificates before they expire.
- Revoke certificates before expiration if they become compromised or should no longer be trusted.
- Automate certificate deployment and renewal where supported.
- Maintain an inventory of certificates across the environment.
Effective certificate lifecycle management helps reduce authentication failures and service disruptions.
How Hexnode simplifies certificate management
Hexnode UEM helps organizations centrally deploy and manage digital certificates across supported devices. Depending on platform, ownership, and enrollment requirements, IT administrators can distribute certificates and configure supported certificate-based authentication workflows, including documented Wi-Fi and VPN use cases, through methods such as SCEP.
FAQs
Applications and services reject expired certificates, which can cause authentication failures and disrupt secure connections until administrators install a valid certificate.
It depends on the certificate type, licensing terms, and security policy. Many organizations issue unique certificates for individual users, devices, or servers.
