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Service A hashes a message, resulting in message digest X. Service A encrypts the message digest X with its private key, resulting ir ciphertext X1. Service A sends the message and X1 to Service B . Service B hashes the message, resulting in message digest Y. Service B decrypts X1 with Service A's public key, recovering message digest X. Service B compares Y with X and finds them to be equal. This proves that:
Suggested Answer: D
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13 comments · newest first
MA
Mabelle
11 months ago
All of the above makes sense to me!
VE
Verda
12 months ago
Public key cryptography is definitely in play here.
BR
Britt
12 months ago
Wait, how does this prove that? Sounds a bit off.
DO
Dolores
1 year ago
Totally agree, but also, only Service A could've sent it.
KI
King
1 year ago
The message was not altered, that's a key point!
EL
Ellsworth
1 year ago
I definitely recall that public key cryptography was involved, but I’m not sure if that’s the only thing we can conclude from this scenario. It feels like there's more to it.
DO
Dorothy
1 year ago
I feel like I might be mixing up the concepts here. I know that comparing the digests shows integrity, but does it really confirm that only Service A sent the message?
SK
Skye
1 year ago
This reminds me of a practice question where we had to identify what a digital signature proves. I think it might be option D since it covers all aspects mentioned.
KR
Kristin
1 year ago
I remember studying how hashing and encryption work together, but I'm not entirely sure if the answer is just about the message being unaltered or if it proves more than that.
RE
Reita
1 year ago
I'm feeling pretty confident about this one. Case sensitivity is a common programming concept, so I think I can apply that knowledge to select the right answer.
CR
Craig
1 year ago
I think the fishbone diagram is sometimes called a cause and effect diagram, but I'm not entirely sure.
LY
Lynda
1 year ago
I remember discussing the importance of using non-root accounts for administrative tasks. Using the root account seems risky.
MA
Marisha
1 year ago
I'm pretty confident about this one. HTTPS uses TCP port 443 as the default port, and it's a protocol used in the URL address line to connect to a secure site.