With Cipher-block chaining (CBC) what happens?

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

The block cipher is turned into a stream cipher

The message is divided into blocks and each block is encrypted separately. This is the most basic mode for symmetric encryption

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

The cipher text from the current round is XORed with the plaintext for the next round

If you use substitution alone, what weakness is present in the resulting cipher text?

It maintains letter and word frequency

It is the same length as the original text

It is easily broken with modern computers

It maintains letter and word frequency

What is the basis for the FISH algorithm?

Equations that describe an ellipse

The difficulty in factoring numbers

John is trying to explain the basics of cryptography to a group of young, novice, security students. Which one of the following most accurately defines encryption?

Changing a message so it can only be easily read by the intended recipient

Changing a message using complex mathematics

Applying keys to a message to conceal it

Complex mathematics to conceal a message

Changing a message so it can only be easily read by the intended recipient

What must occur in order for a cipher to be considered 'broken'?

Finding any method that is more efficient than brute force

Rendering the cipher no longer useable

What is a 'Collision attack' in cryptography?

Collision attacks try to find two inputs producing the same

Collision attacks try to break the hash into three parts to get the plaintext value

Collision attacks try to get the public key

Collision attacks try to break the hash into two parts, with the same bytes in each part to get the private key

Collision attacks try to find two inputs producing the same

How can rainbow tables be defeated?

Lockout accounts under brute force password cracking attempts

All uppercase character passwords

ECCouncil 212-81 Practice Test 4 - Free Online Exam Questions 121-160

A disk you rotated to encrypt/decrypt. Created by Leon Alberti. Similar technologies were used in the Enigma machine. Considered the forefather of modern encryption.

Become a Premium Member for full access

Unlock Premium Member

ECCouncil 212-81 Practice Test 4

Question

ECCouncil 212-81 Practice Tests

Practice Tests