Exam 312-50 topic 5 question 26 discussion

Actual exam question from ECCouncil's 312-50

Question #: 26
Topic #: 5

For messages sent through an insecure channel, a properly implemented digital signature gives the receiver reason to believe the message was sent by the claimed sender. While using a digital signature, the message digest is encrypted with which key?

A. Sender's public key
B. Receiver's private key
C. Receiver's public key
D. Sender's private key

Show Suggested Answer

Suggested Answer: D 🗳️

by Ka2021ka at Nov. 25, 2021, 10:52 a.m.

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Novmejst

7 months, 1 week ago

Selected Answer: D

D. Sender's private key In a digital signature, the message digest (a fixed-length representation of the original message) is encrypted with the sender's private key. This process creates a unique digital signature that can only be decrypted by the sender's public key, which is widely available. When the receiver gets the message, they can verify its authenticity by using the sender's public key to decrypt the digital signature and comparing it to the message digest they calculated from the received message. If the two match, the receiver can be reasonably sure that the message came from the claimed sender and has not been altered in transit.

upvoted 3 times

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salei

1 year ago

Selected Answer: D

To prove sender identity, they have to encrypt with its own private key. The receiver can prove that he's who's claim to be by properly decrypting the message with the sender public key

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Ka2021ka

2 years ago

Selected Answer: C

Encrypted by receiver’s public key

upvoted 2 times

dorinh

1 year, 12 months ago

Receiver’s public key is available also for an attacker, so he can change the message, generate another hash and encript the hash with the receiver’s public key so the authenticyty of the message is not garanteed. If the hash is encripted with the sender's private key, anyoane can decrypt it with the sender's pubic key to validate the hash. With this approach, the authenticity of the message is guaranteed, as log as the sender's privte key is not compriomised .

upvoted 3 times

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WZ1122

1 year, 8 months ago

Encryption is using receiver's public key and decrypted by receiver's private key. digital signature is using sender's private key and verified by sender's public key.

upvoted 4 times

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HeyacedoGomez

10 months, 1 week ago

I think the question stated signing......and that's done by hashing the data with sender's PRIVATE key.....

upvoted 3 times

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