Deal of The Day! Hurry Up, Grab the Special Discount - Save 25% - Ends In 00:00:00 Coupon code: SAVE25
Welcome to Pass4Success

- Free Preparation Discussions

Eccouncil Exam 212-81 Topic 2 Question 30 Discussion

Actual exam question for Eccouncil's 212-81 exam
Question #: 30
Topic #: 2
[All 212-81 Questions]

If Bob is using asymmetric cryptography and wants to send a message to Alice so that only she can decrypt it, what key should he use to encrypt the message?

Show Suggested Answer Hide Answer
Suggested Answer: D

Vigenre

https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher

The Vigenre cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution.

First described by Giovan Battista Bellaso in 1553, the cipher is easy to understand and implement, but it resisted all attempts to break it until 1863, three centuries later. This earned it the description le chiffre indchiffrable (French for 'the indecipherable cipher'). Many people have tried to implement encryption schemes that are essentially Vigenre ciphers. In 1863, Friedrich Kasiski was the first to publish a general method of deciphering Vigenre ciphers.


Contribute your Thoughts:

Freeman
3 days ago
I think it's Alice's public key, that's how asymmetric encryption works, right? Gotta keep those private keys private!
upvoted 0 times
...
Lettie
5 days ago
No, because only I have the corresponding private key to decrypt it.
upvoted 0 times
...
Tegan
5 days ago
But wouldn't that mean anyone with my public key could decrypt it?
upvoted 0 times
...
Lettie
7 days ago
I think Bob should use my public key to encrypt the message.
upvoted 0 times
...

Save Cancel