Question

The high-class reporter for foreign affairs learned about asymmetric cryptography, and proposed to security team at the paper to generate for a pair of public or private RSA keys, to allow to publish public key, and encourage citizens in oppressed regimes to write with that public key, and to assure the writers that only decrypt their messages, and therefore they have nothing to fear from regime they live under. On security team said- "You would put your informers in danger. The regime will detect ciphertext and coerce writer to disclose its content. Not really, answer -the informer could use a different key that would decrypt the ciphertext to an innocuous plaintext. Then, the security chief, said-What if a hacker from the oppressive regime will pretend to be you, and publish his key as being yours and so attract and trap dissidents? This won't work answered. People using the fake public key will see a mismatch on the Euler function". But "prefer Diffie Hellman" for the purpose of facilitating a back and forth communication channel". "That won't be a good idea because with Diffie-Hellman won't know for sure that I am not talking to a secret agent from the regime, but with RSA I the identity of the other party is firmly established".