6. Textual Encoding of Certificate Revocation Lists

Certificate Revocation Lists (CRLs) are encoded using the "X509 CRL" label. The encoded data MUST be a BER (DER strongly preferred; see Appendix B) encoded ASN.1 CertificateList structure as described in Section 5 of [RFC5280].

-----BEGIN X509 CRL-----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-----END X509 CRL-----

Figure 8: CRL Example

Historically, the label "CRL" has rarely been used. Today, it is not common and many popular tools do not understand the label. Therefore, this document standardizes "X509 CRL" in order to promote interoperability and backwards-compatibility. Generators conforming to this document MUST generate "X509 CRL" labels and MUST NOT generate "CRL" labels. Parsers SHOULD NOT treat "CRL" as equivalent to "X509 CRL".