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A protocol for checking the revocation status of a digital X.509 certificate without requiring CRLs.

A list of digital certificate serial numbers that have been revoked by the issuing CA before their scheduled expiration.

Encryption using a pair of keys, where one key encrypts data, and the other key decrypts it.

A mathematical scheme for verifying the authenticity of digital messages or documents.

A document that describes in detail how the CA uses and manages the certificates it issues.

The key provided to everyone to encrypt messages for the key holder.

A document which states the different purposes of certificates and their approved uses within a PKI.

A process by which keys are held in trust by a third party, allowing encrypted data to be accessed under predefined conditions.

An extension to X.509 that allows various values to be associated with a security certificate.

The confidential key used by the owner to decrypt messages.

An entity that issues digital certificates, affirming the identity of the certificate holder.

An authority in a network that verifies user requests for a digital certificate and tells the CA to issue it.

A standard format for public key certificates, defining their structure.

A set of two keys used in a PKI, one public and one private, that are mathematically related.

An explanation for why a certificate is no longer valid and has been revoked.

A public key certificate which can be used with multiple subdomains of a domain.

A cryptographic system that uses a pair of keys, a public key for encrypting data and a private key for decrypting data.

A certificate issued by a trusted CA that can issue other certificates, creating a chain of trust.

The process of converting information into a secure format that hides its true meaning.

Encryption that uses the same secret key for both encryption and decryption.

A group of standards for public-key cryptography that includes PKCS#1, PKCS#12, etc., developed by RSA Laboratories.

A self-signed certificate that identifies the Root CA.

A function that converts an input (or 'message') into a fixed-size string of bytes, typically for security purposes.

The series of trusted intermediaries between a root CA and the end-entity certificate.

Protocols for establishing authenticated and encrypted links between networked computers.

An electronic document used to prove the ownership of a public key.

The process of converting encrypted information back into its original format.

A message sent from an applicant to a CA, containing information required for issuing a digital certificate.