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What is symmetric encryption?
Suggested Answer: C
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40 comments · newest first
CA
Cathern
11 months ago
Option A is misleading, it doesn't create a MAC.
LE
Leonie
11 months ago
I thought symmetric keys had to be longer than the message.
VE
Veronica
11 months ago
Wait, isn't symmetric encryption supposed to be faster than asymmetric?
LA
Lazaro
12 months ago
Totally agree, option C is spot on!
TI
Tiera
12 months ago
Symmetric encryption uses the same key for both encryption and decryption.
LA
Laurene
12 months ago
I vaguely recall that symmetric encryption uses a single key, but I’m not sure if it’s related to the size of the key or the message itself like in option D.
MI
Micah
1 year ago
I’m a bit confused; I thought symmetric encryption also had to do with the length of the ciphertext matching the plaintext. Is that what option B is saying?
MI
Minna
1 year ago
I remember practicing a question that mentioned something about keys, and I think option C sounds right since it talks about using the same key.
CR
Crissy
1 year ago
I think symmetric encryption is about using the same key for both encrypting and decrypting, but I'm not entirely sure if that's the whole definition.
WI
Wilford
1 year ago
I'm a bit confused by the wording of these options. I know symmetric encryption has something to do with the key being the same for both encryption and decryption, but I'm not sure which option best describes that. I'll have to re-read the question and options more closely.
AL
Albert
1 year ago
Okay, I remember learning about symmetric encryption in class. I believe it's the type of encryption that uses the same key for both encryption and decryption, so I'll go with option C.
KR
Kristel
1 year ago
Hmm, this is a tricky one. I'm not totally sure about the differences between the options. I'll have to think it through carefully before selecting an answer.
HA
Hannah
1 year ago
I'm pretty confident I know the answer to this one. Symmetric encryption uses the same key to encrypt and decrypt the data, so option C looks like the right choice.
AL
Alesia
1 year ago
This is a good test of our knowledge on symmetric encryption. I'll review the key concepts quickly before selecting my answer.
LO
Louvenia
1 year ago
I'm pretty sure symmetric encryption uses the same key for both encryption and decryption. Let me double-check the other options to make sure I have the right understanding.
BR
Britt
1 year ago
Wait, I'm a bit confused. Is symmetric encryption the same as having the same key for encryption and decryption? Or is there more to it than that?
LE
Lenna
1 year ago
Okay, I've got a good handle on symmetric encryption from the lectures. I think I know the right answer here.
PA
Patria
1 year ago
Hmm, this looks like a tricky one. I'll need to think carefully about the key characteristics of symmetric encryption to answer this properly.
HO
Hoa
2 years ago
Symmetric encryption? More like 'same-same' encryption if you ask me. But hey, at least it's not 'asymmetric' - that would just be confusing!
MA
Margery
2 years ago
D) seems like it's describing a one-time pad, which is a special case of symmetric encryption. I'm sticking with C.
FE
Felton
2 years ago
B) sounds like it's just describing the concept of a block cipher, not symmetric encryption specifically. I'll go with C.
SH
Shawn
2 years ago
B) sounds like it's just describing the concept of a block cipher, not symmetric encryption specifically. I'll go with C.
SH
Shawn
2 years ago
C) It uses the same key to encrypt plaintext as to decrypt ciphertext.
NE
Nelida
2 years ago
I'm not sure, but I think option B could also be correct, ensuring same length ciphertext.
DO
Dong
2 years ago
I believe it's option A, as it creates both ciphertext and MAC simultaneously.
TY
Ty
2 years ago
I'm pretty sure it's C. I mean, if you can't encrypt and decrypt with the same key, what's the point of calling it 'symmetric'?
LE
Leatha
2 years ago
I'm pretty sure it's C. I mean, if you can't encrypt and decrypt with the same key, what's the point of calling it 'symmetric'?
DA
Danilo
2 years ago
C) It uses the same key to encrypt plaintext as to decrypt ciphertext.
ED
Edda
2 years ago
Yeah, that's why it's called symmetric encryption.
ST
Stefanie
2 years ago
B) It any form of encryption mat ensures that thee ciphertext Is the same length as the plaintext.
LI
Lisbeth
2 years ago
I think you're right, it does use the same key for both encryption and decryption.
FE
Felicitas
2 years ago
A) It simultaneously creates ciphertext and a same-size MAC.
BE
Belen
2 years ago
I think it's option C, because that's how symmetric encryption works.
CA
Catalina
2 years ago
Symmetric encryption uses the same key to encrypt and decrypt.
XO
Xochitl
2 years ago
C) is the correct answer. Symmetric encryption uses the same key for both encryption and decryption.
WY
Wynell
2 years ago
A) It simultaneously creates ciphertext and a same-size MAC.
WY
Wynell
2 years ago
C) It uses the same key to encrypt plaintext as to decrypt ciphertext.
AR
Arlyne
2 years ago
Definitely, it simplifies the process.
BI
Billy
2 years ago
That makes sense, it's more efficient that way.
CA
Carmen
2 years ago
C) It uses the same key to encrypt plaintext as to decrypt ciphertext.