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A typical X.509 certificate is the combination of data (including a public key $Pub_B$), and of a signature $Sig_A$ of that data, to be verified with an unrelated public key $Pub_A$. In order for the verifier to know which hash to use when verifying $Sig_A$, there is use for a field in said data specifying the hash used by $Sig_A$, and that's the purpose of ...

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