Example certificate chains when using cross-certification at root CA level between two PKIs<br><ul><li>Each box represents a certificate, with its Subject in bold.</li>
<li>Arrows between certificates mean "signed by" (or, more precisely, "signed by the secret key corresponding to the public key contained in...").</li>
<li>Certificates with the same color (that are not white) contain the same public key.</li></ul>
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