Question 75

Explanation

Correct Answer: D. Compromising the sender's private key. Explanation: In RSA encryption, a digital signature is created by using the sender's private key to encrypt a hash value of the message. This digital signature can be verified using the corresponding public key. The security of the digital signature relies on the confidentiality and integrity of the private key. If an attacker compromises the sender's private key (Option D), they can generate fraudulent digital signatures for any message, making it appear as if it was sent by the legitimate sender. This compromises the control provided by the digital signature and undermines its authenticity and non-repudiation properties. Intercepting the digital signature during transmission (Option A) or manipulating the encrypted message (Option B) does not compromise the control provided by the digital signature itself. These actions may affect the confidentiality or integrity of the message but do not directly compromise the digital signature mechanism. Compromising the recipient's public key (Option C) may impact the recipient's ability to verify the digital signature, but it does not compromise the control provided by the digital signature created using the sender's private key. Therefore, the action that is MOST likely to compromise the control provided by a digital signature created using RSA encryption is compromising the sender's private key.