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I am very new in cryptography field, what I want to ask but I cannot find an answer is this: In public key cryptography, such as in RSA, does it matter if the adversary knows/can detect the public key? With only the public key, can he eavesdrop a message?

Thank you

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The public key is published in public so that anyone (including attackers) can get it. The point of public-key crypto is to be able to do so without compromising security in any way.

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Public key cryptography is named public because public keys are considered to be available to everyone and this alone is not sufficient to decrypt messages.

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