GAQM Exam CPEH-001 Topic 4 Question 97 Discussion

Actual exam question for GAQM's CPEH-001 exam

Question #: 97
Topic #: 4

In the context of using PKI, when Sven wishes to send a secret message to Bob, he looks up Bob's public key in a directory, uses it to encrypt the message before sending it off. Bob then uses his private key to decrypt the message and reads it. No one listening on can decrypt the message. Anyone can send an encrypted message to Bob but only Bob can read it. Thus, although many people may know Bob's public key and use it to verify Bob's signature, they cannot discover Bob's private key and use it to forge digital signatures. What does this principle refer to?

AIrreversibility

BNon-repudiation

CSymmetry

DAsymmetry

Show Suggested Answer

Suggested Answer: D

PKI uses asymmetric key pair encryption. One key of the pair is the only way to decrypt data encrypted with the other.

by Garry at Sep 18, 2024, 09:45 AM

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Brande

27 days ago

Asymmetry all the way! The whole beauty of public-key crypto is that the public key can be used to encrypt, but the private key is the only way to decrypt. Nicely done, test writer!

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Mabel

21 hours ago

D) Asymmetry

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Dannette

3 days ago

C) Symmetry

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Serita

8 days ago

B) Non-repudiation

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Krissy

12 days ago

A) Irreversibility

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Kenia

29 days ago

Haha, I love these cryptography questions. They're like little puzzles. This one's a classic example of asymmetric encryption - the public and private keys are a perfect match!

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Phuong

1 months ago

Ooh, tricky one! I was thinking Irreversibility at first, but then I realized that's more about the difficulty of reversing the encryption, not the key relationship. Definitely Asymmetry.

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Karan

10 days ago

Yes, the principle refers to Asymmetry in this context.

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Audra

12 days ago

Asymmetry is the correct answer in this case.

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Sherell

18 days ago

I agree, it's definitely Asymmetry.

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Barney

1 months ago

Hmm, I was kind of torn between Asymmetry and Non-repudiation, but I think Asymmetry is the best fit. The whole point is that the private key can't be derived from the public key, which is the essence of asymmetry.

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Lili

1 months ago

I believe the correct answer is D) Asymmetry, as only Helga can decrypt the message with his private key.

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Audra

2 months ago

This seems pretty straightforward. Asymmetry is the key principle behind public-key cryptography, where the public and private keys are different but mathematically related. Totally makes sense here.

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