This was on my exam (5 Aug 2020). I chose A (AES). My post exam score report showed no errors in the areas 6.1 ("Compare and contrast basic concepts of cryptography.") and 6.2 ("Explain cryptography algorithms and their basic characteristics.") which are the areas coverd by this question; so I'm pretty sure my answer (A) was correct. However, if you love the risk ... go ahead with D
A. AES is one of the the most advanced encryption protocols available - good for encrypting large amounts of data.
Not B. SHA-2 is a hashing algorithm.
Not C. SSL is deprecated.
Not D. RSA is a public-key system mostly used for agreeing on relatively short session keys rather than encrypting large amounts of data.
I think the word "message" implies a relatively small amount of data such as an email.
https://medium.com/@weblab_tech/encrypted-client-server-communication-protection-of-privacy-and-integrity-with-aes-and-rsa-in-c7b180fe614e
AES is a symmetric encryption algorithm. It uses the same key for encryption and decryption. Large amounts of data can be encrypted using a symmetric encryption algorithm.
RSA — an asymmetric encryption algorithm, based on using public and private keys. A message is encrypted using a public key and can be decrypted only with a private key.
I don't think it's common for 3 different parties to exchange messages. All 3 would have to know the same key.
https://www.comparitech.com/blog/information-security/encryption-types-explained/
Symmetric-key cryptography is great to use when just one person needs to encrypt and decrypt data, or when multiple parties have an pportunity to share the key beforehand.vvWhile it’s useful in a number of situations, there are others where it can be problematic. What if someone wants to communicate securely with someone that they’ve never met before? vvThey obviously wouldn’t have had a chance to share the key beforehand, and they probably don’t have a secure channel that they can use to send the code through to their intended recipient. This brings us to the other major type of cryptography, public-key encryption.
The quesrion asks about encrypting the message,you encript the message withe AES and use public key infrastructure to deliver the key, it is comon to use the two together,so the answer is A since they ask how to encrypt the message
Generally, AES and RSA are correct. AES256 can be used for data in transition but as it is use oy one key, receiver should know it to be able to open (we can say that this can be sometimes tricky)... In other hand RSA use paired keys which require PKI infrastructure but it is no transfering of secrets... Also you can use AES and RSA together, RSA for exchanging of AES key... As it is third party, maybe they do not have digital certificates in place for secure data exchange so in that case we will need to go with AES... It is 50%-50% answer, and from my pov it is easier to use aes (litlle less secure because prerequisite of secret exchange) and rsa is more secure but complexity is higher as require PKI, so it could be more unconvenient ... As Comptia has own favorites when we came in front of those questiones, I would choose AES...
The questions asks about encrypting a message.
from the wiki
"RSA is an algorithm used by modern computers to encrypt and decrypt messages"
plus AES is is private key algorithm.
upvoted 2 times
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