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The MustStaple TLS extension in a certificate can require that the certificate be verified by a stapled OCSP response, mitigating this problem. [10] OCSP also remains a valid defense against situations where the attacker is not a "man-in-the-middle" (code-signing or certificates issued in error).
RFC 6961 defines a Multiple Certificate Status Request extension, which allows a server to send multiple OCSP responses in the TLS handshake. A draft proposal for an X509v3 extension field, which expired in April 2013, specified that a compliant server presenting a certificate carrying the extension must return a valid OCSP token in its ...
An example of Extended Validation Certificate, issued by GlobalSign. An Extended Validation (EV) Certificate is a certificate conforming to X.509 that proves the legal entity of the owner and is signed by a certificate authority key that can issue EV certificates.
RFC 7633 defines an extension that embeds a requirement into a certificate to be stapled to a valid OCSP response. [34] With this extension, stapling can be effective for the case where a certificate has been compromised after proper issuance; however, if a certificate can be misissued without the extension, stapling may not provide any security.
This reversible status can be used to note the temporary invalidity of the certificate (e.g., if the user is unsure if the private key has been lost). If, in this example, the private key was found and nobody had access to it, the status could be reinstated, and the certificate is valid again, thus removing the certificate from future CRLs.
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In cryptography, X.509 is an International Telecommunication Union (ITU) standard defining the format of public key certificates. [1] X.509 certificates are used in many Internet protocols, including TLS/SSL, which is the basis for HTTPS, [2] the secure protocol for browsing the web.
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