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CRL Distribution
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CRL files can be requested by individuals who need to verify and validate a newly received certificate, or the files can be periodically pushed down (sent) to all users participating within a specific PKI This means the CRL can be pulled (downloaded) by individual users when needed or pushed down to all users within the PKI on a timed interval The actual CRL file can grow substantially, and transmitting this file and requiring PKI client software on each workstation to save and maintain it can use a lot of resources, so the smaller the CRL is, the better It is also possible to first push down the full CRL, and after that initial load, the following CRLs pushed down to the users are delta CRLs, meaning that they contain only the changes to the original or base CRL This can greatly reduce the amount of bandwidth consumed when updating CRLs In implementations where the CRLs are not pushed down to individual systems, the users PKI software needs to know where to look for the posted CRL that relates to the certificate it is trying to validate The certificate might have an extension that points the validating user to the necessary CRL distribution point The network administrator sets up the distribution points, and one or more points can exist for a particular PKI The distribution point holds one or more lists containing the serial numbers of revoked certificates, and the user s PKI software scans the list(s) for the serial number of the certificate the user is attempting to validate If the serial number is not present, the user
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5: Public Key Infrastructure
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is assured that it has not been revoked This approach helps point users to the right resource and also reduces the amount of information that needs to be scanned when checking that a certificate has not been revoked One last option for checking distributed CRLs is an online service When a client user needs to validate a certificate and ensure that it has not been revoked, he can communicate with an online service that will query the necessary CRLs available within the environment This service can query the lists for the client instead of pushing down the full CRL to each and every system So if Joe receives a certificate from Stacy, he can contact an online service and send it the serial number listed in the certificate Stacy sent The online service would query the necessary revocation lists and respond to Joe indicating whether that serial number was listed as being revoked or not One of the protocols used for online revocation services is OCSP, a request and response protocol that obtains the serial number of the certificate that is being validated and reviews revocation lists for the client The protocol has a responder service that reports the status of the certificate back to the client, indicating whether it has been revoked, it is valid, or its status is unknown This protocol and service saves the client from having to find, download, and process the right lists
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Instead of being revoked, a certificate can be suspended, meaning it is temporarily put on hold If, for example, Bob is taking an extended vacation and wants to ensure that his certificate will not be used during that time, he can make a suspension request to the CA The CRL would list this certificate and its serial number, and in the field that describes why the certificate is revoked, it would instead indicate a hold state Once Bob returns to work, he can make a request to the CA to remove his certificate from the list Another reason to suspend a certificate is if an administrator is suspicious that a private key might have been compromised While the issue is under investigation, the certificate can be suspended to ensure that it cannot be used
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