Discuss EC-Council 112-51 Exam Topic 1 Question 4

Peter, a security professional, was hired by an organization and was instructed to secure the application and its content from unauthorized access. In this process, Peter implemented a public-key cryptosystem that uses modular arithmetic and elementary number theory for Internet encryption and user authentication.

Which of the following algorithms was employed by Peter in the above scenario?

ARSA

BMD6

CDSA

DSHA-2

Suggested Answer: A

RSA is a public-key cryptosystem that uses modular arithmetic and elementary number theory for Internet encryption and user authentication. RSA stands for Rivest-Shamir-Adleman, the names of the inventors of the algorithm. RSA allows users to generate a pair of keys, one public and one private, that are mathematically related. The public key can be used to encrypt messages or verify digital signatures, while the private key can be used to decrypt messages or create digital signatures. RSA is based on the difficulty of factoring large numbers, which makes it secure and widely used12. Reference: What is Public-Key Cryptosystem in Information Security?, Network Defense Essentials (NDE) | Coursera

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31 comments · newest first

Samira 11 months ago

SHA-2 is for hashing, not encryption. Gotta be RSA!

Brittni 11 months ago

Surprised they didn't mention ECC, but yeah, RSA fits.

Venita 11 months ago

No way it's MD6, that's not even a public-key system!

Malcolm 12 months ago

I think it could be DSA too, but RSA is more common.

Shaun 12 months ago

Definitely RSA, it’s the go-to for public-key cryptography.

Catina 1 year ago

I thought MD6 and SHA-2 were hashing algorithms, so they probably wouldn't fit this scenario with encryption.

Katina 1 year ago

I practiced a similar question where RSA was the answer, so I'm leaning towards that for this one too.

Alyssa 1 year ago

I'm not entirely sure, but I feel like DSA is more about digital signatures, not really encryption like RSA.

Peggie 1 year ago

I remember studying public-key cryptosystems, and I think RSA is the most common one that uses modular arithmetic.

Thurman 1 year ago

I'm a little confused by this one. The details about modular arithmetic and number theory make me think it's probably a public-key algorithm, but I'm not totally sure which one. I'll have to review my notes on cryptographic algorithms to make the best guess.

Daren 1 year ago

Okay, let's see. The question says the algorithm uses "modular arithmetic and elementary number theory", which rules out hash functions like MD6 or SHA-2. I think RSA is the most likely answer, but I'll double-check the details just to be sure.

Elke 1 year ago

Hmm, I'm a bit unsure here. The question mentions "Internet encryption and user authentication", so it could also be something like DSA, which is used for digital signatures. I'll have to think this through carefully.

Letha 1 year ago

This looks like a straightforward cryptography question. I'm pretty confident the answer is RSA, since it's a widely used public-key cryptosystem that relies on modular arithmetic.

Cordelia 1 year ago

The presence of the processing instruction is throwing me off a bit. I'll need to double-check the rules around that to make sure I select the right answer.

Marica 1 year ago

Okay, I think I've got a good strategy here. First, I'll check the end user configuration to make sure the desk phone is listed as a controlled device. Then I'll double-check the service profile to ensure the CTI servers are properly configured. Shouldn't be too hard to track down the issue.

Daisy 1 year ago

I feel pretty confident about this one. Option D seems to capture the main benefit of leveraging business architecture in defining a solution architecture - it provides a broader, strategic perspective beyond individual projects.

Titus 1 year ago

I'm not entirely sure, but I think they focus more on integrating financial and non-financial info rather than just writing reports.

Viva 2 years ago

I don't think DSA fits the scenario as well as RSA does. RSA is more commonly used for this purpose.

Kate 2 years ago

But what about DSA? It also involves modular arithmetic and could be a possible choice.

Carylon 2 years ago

I agree with Glory, RSA is commonly used for Internet encryption and user authentication.

Glory 2 years ago

I think Peter used RSA algorithm because it involves modular arithmetic and number theory.

Ardella 2 years ago

RSA is based on modular arithmetic and is widely used for encryption and user authentication.

Shantay 2 years ago

I'm not sure. Can someone explain why RSA is the most suitable choice?

Latonia 2 years ago

I agree with RSA is commonly used for Internet encryption.

Linwood 3 years ago

I think Peter employed the RSA algorithm.

Louann 3 years ago

Alright, alright, let's not get too carried away here. I think the answer is clearly A) RSA. It's the most widely used public-key algorithm, and the description fits it like a glove.

Rolande 3 years ago

I'm not so sure. MD6 is a newer hash function, and it could potentially be used in a public-key system. This one's got me stumped.

Mary 2 years ago

↳ replying to Rolande

I think A) RSA makes sense here

Orville 2 years ago

↳ replying to Rolande

I'm going with C) DSA

Katlyn 2 years ago

↳ replying to Rolande

A) RSA

Ashlyn 3 years ago

Ah, this question is a classic! Public-key cryptosystem, modular arithmetic, and number theory? That's gotta be RSA, no doubt about it.

EC-Council 112-51 Exam - Topic 1 Question 4 Discussion