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If an attacker gains access to the private key in an RSA encryption system used for secure email, which consequence follows?

A)Only future messages are compromised
B)Message integrity remains guaranteed
C)The public key becomes invalid
D)Past encrypted emails can be decrypted

💡 Explanation

The attacker can use the compromised private key to reverse the encryption applied to all past emails, because RSA decryption relies on the private key derived during key generation. Therefore, past encrypted emails are vulnerable, rather than only future messages being affected, or message integrity remaining secure.

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