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Is there a CRL size that is beyond a practical limit? I did not find anything in the RFC. Is there any limit at all on the size of CRLs?

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I don't think there is a size limit, though other practical and security limitations should limit their size. The largest I've seen was one from Thawte at ~5MB. Most CRLs are distributed with Delta locations so clients don't need to constantly pull the whole thing.

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Is the theoretical limit 16^160? – Brian Feb 15 '12 at 15:42

The length of your CRL will be directly proportional to the number of certificates you've revoked. There's no limit on the number of Certificates you can sign, therefore there's no limit on the number you can revoke. By the fact itself, there's no limit on the length of your CRL.

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