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I'll leave alone the OpenPGP spec, and consider the problem of identifying among $k$ public keys $(n_i,e_i)$ the RSA public key $(n_j,e_j)$ used to encrypt $m$ messages per RSA with proper encryption padding. The only way is by examining the $m$ cryptograms $c_\ell$, which essentially are indistinguishable from uniformly random in $[0,n_j)$ (I assume the $c_\...

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