Means, in respect of any electronic Data, to check the Digital Signature(s) or Message Authentication Code within those Data (as applicable) using:
(a) the Public Key contained in the certificate issued by the relevant Certificate Authority associated with the Private Key of the person or device that those Data identify, or imply has generated the Digital Signature;
(b) where applicable, the recipient’s relevant Private Key; and
(c) the relevant algorithm identified in the certificate policy under which the relevant certificates were issued (or, where such certificate or certificate policy does not exist, the appropriate algorithm).