ExamGecko
Search Search Login
Home Home / ECCouncil / 212-81
Question list
Search
Search
Open VPLUS File
Convert VPLUS to PDF

Related questions

Represents the total number of possible values of keys in a cryptographic algorithm or other security measure, such as a password.
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?
Message hidden in unrelated text. Sender and receiver have pre-arranged to use a pattern to remove certain letters from the message which leaves only the true message behind.
3DES can best be classified as which one of the following?
Nicholas is working at a bank in Germany. He is looking at German standards for pseudo random number generators. He wants a good PRNG for generating symmetric keys. The German Federal Office for Information Security (BSI) has established four criteria for quality of random number generators. Which ones can be used for cryptography?
In 2007, this wireless security algorithm was rendered useless by capturing packets and discovering the passkey in a matter of seconds. This security flaw led to a network invasion of TJ Maxx and data theft through a technique known as wardriving. Which Algorithm is this referring to?
Ahlen is using a set of pre-calculated hashes to attempt to derive the passwords from a Windows SAM file. What is a set of pre-calculated hashes used to derive a hashed password called?
Which of the following is the successor of SSL?
You are studying classic ciphers. You have been examining the difference between single substitution and multi-substitution. Which one of the following is an example of a multi-alphabet cipher?
A cryptanalysis success where the attacker discovers additional plain texts (or cipher texts) not previously known.

Question 124 - 212-81 discussion

Report
Export

With Cipher-block chaining (CBC) what happens?

A.
The block cipher is turned into a stream cipher
Answers
A.
The block cipher is turned into a stream cipher
B.
The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption
Answers
B.
The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption
C.
Each block of plaintext is XORed with the previous ciphertext block before being encrypted
Answers
C.
Each block of plaintext is XORed with the previous ciphertext block before being encrypted
D.
The cipher text from the current round is XORed with the plaintext for the next round
Answers
D.
The cipher text from the current round is XORed with the plaintext for the next round
Suggested answer: C

Explanation:

Each block of plaintext is XORed with the previous ciphertext block before being encrypted

https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#Cipher_block_chaining_(CBC)

In CBC mode, each block of plaintext is XORed with the previous ciphertext block before being encrypted. This way, each ciphertext block depends on all plaintext blocks processed up to that point. To make each message unique, an initialization vector must be used in the first block.

Show Answer
asked 18/09/2024
Casie Clements
37 questions
PreviousPreviousNextNext
User
Your answer:
0 comments
Sorted by

Leave a comment first

ExamGecko

Copyright @2023 ExamGecko | All right reserved

Mail us: [email protected]
About us
Contact us
Twitter X
Facebook
Medium
Convert VPLUS to PDF
Open VPLUS files Easily and Quickly
Privacy Policy
Disclaimer
Terms