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Certificate Revocation List (CRL)

📜 Certificate Revocation List: Fundamentals and Implementation A certificate revocation list (CRL) acts as a digital directory maintained by authorities to identify security credentials that are no longer reliable. While certificates naturally expire, they may be invalidated early due to security breaches, lost private keys, or administrative errors. To maintain safety, systems must check these lists regularly to ensure they do not trust compromised data. The revocation process can be permanent or temporary, with the latter allowing a certificate to be reinstated if a suspected risk is resolved. Although alternative methods like OCSP were developed for speed, CRLs remain a fundamental component of public key infrastructure due to privacy and reliability advantages. Proper implementation of these lists is essential to prevent unauthorized access and maintain the integrity of encrypted communications.