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Exam CISA topic 1 question 496 discussion

Actual exam question from Isaca's CISA
Question #: 496
Topic #: 1
[All CISA Questions]

Which of the following will MOST likely compromise the control provided by a digital signature created using RSA encryption?

  • A. Altering the plaintext message
  • B. Deciphering the receiver's public key
  • C. Obtaining the sender's private key
  • D. Reversing the hash function using the digest
Show Suggested Answer Hide Answer
Suggested Answer: C 🗳️
by MunaM at Sept. 7, 2022, 4:31 a.m.

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PurpleParrot
3 months, 2 weeks ago
The answer is C. The security of the signature relies on the private key, not the public key.
upvoted 1 times
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SuperMax
1 year, 2 months ago
Selected Answer: C
C. Obtaining the sender's private key
upvoted 1 times
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cidigi
1 year, 3 months ago
C is the correct. B. No need to decipher and OPEN to PUBLIC key
upvoted 1 times
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swmasinde
1 year, 7 months ago
B. Deciphering the receiver's public key
upvoted 1 times
...
Victor83516
2 years, 1 month ago
Selected Answer: C
agree with C, Breaking the public key means little.
upvoted 2 times
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thabogumpo
2 years, 1 month ago
agree with C
upvoted 1 times
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MunaM
2 years, 2 months ago
seems like answer is C as digital signature will be compromised if sender's private key is compromised.
upvoted 4 times
...

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C (25%)
B (20%)
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