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Dr. Alice needs to send patient Bob a prescription electronically. Dr. Alice wants to send the message such that Bob can be sure that the sender of the prescription was in fact Dr. Alice. Dr. Alice decides to encrypt the message as well as include her digital signature. What key will Bob use to be able to decrypt the session key used by Dr. Alice?
Suggested Answer: D
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31 comments · newest first
AV
Avery
11 months ago
Encryption and digital signatures are key for secure communication!
NA
Nathalie
11 months ago
Just to clarify, it's definitely Dr. Alice's public key, right?
GE
Geraldine
11 months ago
Wait, are we sure it's not Bob's private key? That seems odd.
AR
Arlean
12 months ago
Totally agree, public key is the way to go!
JO
Joesph
12 months ago
Bob will use Dr. Alice's public key to decrypt the session key.
SH
Shawana
1 year ago
I remember that in digital signatures, the sender's private key is used for signing, but for decryption, Bob should use the public key. So, it must be Dr. Alice's public key.
MA
Margurite
1 year ago
I’m a bit confused about whether Bob would use his own private key or Dr. Alice's public key. I need to double-check that.
MA
Malcom
1 year ago
This reminds me of a practice question where we had to identify keys used in encryption. I feel like the public key is definitely involved here.
SH
Sherell
1 year ago
I think Bob would use Dr. Alice's public key to decrypt the session key, but I'm not entirely sure.
RO
Rodney
1 year ago
This is a good test of our understanding of public-key cryptography. I think the key here is that Dr. Alice is encrypting the message, so Bob will need to use her public key to decrypt it and access the session key. The answer is B, Dr. Alice's public key.
MA
Maile
1 year ago
I'm a bit confused by the wording of this question. Is Bob using Dr. Alice's public key to decrypt the session key, or is he using something else? I'll have to re-read the question a few times to make sure I understand it properly before answering.
AN
Annelle
1 year ago
Okay, let's see. Dr. Alice is encrypting the message and including her digital signature, so Bob will need to use her public key to verify the signature and decrypt the session key. I'm pretty sure the answer is B, Dr. Alice's public key.
TH
Theron
1 year ago
Hmm, I'm a little unsure about this one. I know we covered digital signatures and session keys in class, but I'm not 100% confident I can apply that knowledge here. I'll have to think it through carefully.
BE
Bernadine
1 year ago
This seems like a pretty straightforward question on public-key cryptography. I think I've got a good handle on this concept, so I'll give it a shot.
SA
Sabrina
2 years ago
Option B is the way to go. Dr. Alice's public key is the one that should be used to verify her digital signature, and it's also the one used to encrypt the session key.
GI
Gilma
2 years ago
This is a tricky one, but I'm leaning towards C. Bob's public key would be the one used to encrypt the session key, so he can then decrypt it with his private key.
SA
Salley
2 years ago
C) Bob's public key
DE
Demetra
2 years ago
B) Dr. Alice's public key
AN
Antonio
2 years ago
A) Dr. Alice's private key
VA
Vallie
2 years ago
I'm going with D. Bob's private key is the only one that can decrypt the session key used by Dr. Alice to encrypt the message.
CH
Cherelle
2 years ago
Actually, it's A. Dr. Alice's private key is used by Bob to decrypt the session key.
EL
Elmer
2 years ago
I think it's B. Dr. Alice's public key is used to encrypt the session key.
LI
Lilli
2 years ago
I agree with Shenika, using her public key adds an extra layer of security to ensure the message is only decrypted by the intended recipient.
SH
Shenika
2 years ago
Using my private key would allow you to decrypt the message, but using my public key ensures that only you can decrypt it.
AL
Allene
2 years ago
Option B seems logical to me. After all, Dr. Alice's public key is the one that should be used to verify her digital signature, right?
DA
Dalene
2 years ago
User1: Exactly, that's how Bob can be sure the message is from Dr. Alice.
KR
Kris
2 years ago
User3: So, Bob will use Dr. Alice's public key to decrypt the session key.
CO
Corazon
2 years ago
User2: Yes, Dr. Alice's public key is used to verify her digital signature.
LE
Leana
2 years ago
User1: I think you're right, option B makes sense.
KE
Keith
2 years ago
But wouldn't it be more secure if I used your private key instead?
SH
Shenika
2 years ago
I think Bob should use my public key to decrypt the session key.