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Issuer

An issuer is the entity identified as having created or signed a credential, certificate, token, or other security artifact.

How 2 Manning books explain it

Authorization in Action

A credential issuer is an entity that creates or signs credentials and whose authority may be recognized for specified credential types.

How it is used
Supplies authoritative external claims as verified context for authorization decisions.
How deep it goes
Explains signing, authority assessment, scoped trust-store entries, status checks, and governance operations.
Examples
Uses AuditsRUs employment credentials, NISA accreditation, and an auditor whose revoked employment credential is denied.
What you can do after
Evaluate/understand whether an issuer is authorized for a credential type and how its claims enter policy evaluation.

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Software Security for Developers

An issuer field is the X.509 certificate field that identifies the certificate authority or entity that issued the certificate.

How it is used
Identifies the authority that created an X.509 certificate and supplies an initial clue for deciding whether its identity should be trusted.
How deep it goes
Defines the issuer’s structured fields and role in trust validation, but defers detailed processing of the remaining X.509 fields.
Examples
Uses a GitHub certificate issued by DigiCert, OpenSSL inspection commands, and a self-signed local development CA.
What you can do after
Operate/configure OpenSSL to inspect an issuer and interpret its country, organization, and common-name components.

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Related concepts

These guides are generated from the text of Manning books by Manning's knowledge graph and link to the sections they draw on. The full books are available on liveBook and at manning.com.