application-security

Certificate Transparency

Definition

Certificate Transparency (CT) is a framework requiring certificate authorities to log all issued TLS certificates to publicly auditable logs. This allows domain owners and security researchers to detect misissued or fraudulent certificates for their domains.

Browsers enforce CT by requiring certificates to include Signed Certificate Timestamps (SCTs) proving inclusion in a recognized CT log.

Related Terms

TLS

Transport Layer Security

PKI

Public Key Infrastructure

HSTS

HTTP Strict Transport Security

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