[Oct 22, 2022] 212-81 Questions Truly Valid For Your EC-COUNCIL Exam! [Q66-Q85]

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[Oct 22, 2022] 212-81 Questions Truly Valid For Your EC-COUNCIL Exam!

212-81 Actual Questions – Instant Download Tests Free Updated Today!

EC-COUNCIL 212-81 Exam Syllabus Topics:

Topic	Details
Topic 1	Cracking Modern Cryptography: Ciphertext-only and Related-key Attack Cracking Modern Cryptography: Chosen Plaintext Attack
Topic 2	Symmetric Block Cipher Algorithms Basic Facts of the Feistel Function
Topic 3	Shiva Password Authentication Protocol (S-PAP) Challenge-Handshake Authentication Protocol (CHAP)
Topic 4	Steganography Implementations Example of Symmetric Stream Ciphers: RC4
Topic 5	Propagating Cipher-Block Chaining (PCBC) Naor-Reingold and Mersenne Twister Pseudorandom Function
Topic 6	Cracking Modern Cryptography Example of Symmetric Stream Ciphers: PIKE
Topic 7	Information Theory Cryptography Concepts Multi-Alphabet Substitution
Topic 8	Server-based Certificate Validation Protocol Classification of Random Number Generator
Topic 9	Point-to-Point Tunneling Protocol (PPTP) National Security Agency and Cryptography

NEW QUESTION 66
Collision resistance is an important property for any hashing algorithm. Joan wants to find a cryptographic hash that has strong collision resistance. Which one of the following is the most collisionresistant?

SHA2

MD5

MD4

PIKE

NEW QUESTION 67
With Cipher feedback (CFB) what happens?

The key is reapplied

The ciphertext block is encrypted then the ciphertext produced is XOR’d back with the plaintext to produce the current ciphertext block

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

NEW QUESTION 68
A symmetric Stream Cipher published by the German engineering firm Seimans in 1993. A software based stream cipher that uses a Lagged Fibonacci generator along with concepts borrowed from shrinking generator ciphers.

DESX

FISH

Twofish

IDEA

NEW QUESTION 69
What is the solution to the equation 8 mod 3?

NEW QUESTION 70
This is a proprietary version of PAP. Encrypts username and password as it is sent across network.

PPTP VPN

S-PAP

Kerberos

WPA2

NEW QUESTION 71
Which one of the following attempts to hide data in plain view?

Cryptography

Substitution

Steganography

Asymmetric cryptography

NEW QUESTION 72
Storing private keys with a third party is referred to as what?

Key caching

Key storage

Key banking

Key escrow

NEW QUESTION 73
A non-secret binary vector used as the initializing input algorithm for encryption of a plaintext block sequence to increase security by introducing additional cryptographic variance.

Salt

L2TP

Nonce

NEW QUESTION 74
DES has a key space of what?

2^128

2^192

2^64

2^56

NEW QUESTION 75
Basic information theory is the basis for modern symmetric ciphers. Understanding the terminology of information theory is, therefore, important. If a single change of a single bit in the plaintext causes changes in all the bits of the resulting ciphertext, what is this called?

Complete diffusion

Complete scrambling

Complete confusion

Complete avalanche

NEW QUESTION 76
Which one of the following uses three different keys, all of the same size?

3DES

AES

RSA

DES

NEW QUESTION 77
In a Feistel cipher, the two halves of the block are swapped in each round. What does this provide?

Diffusion

Confusion

Avalanche

Substitution

NEW QUESTION 78
The most widely used digital certificate standard. First issued July 3, 1988. It is a digital document that contains a public key signed by the trusted third party, which is known as a Certificate Authority, or CA.
Relied on by S/MIME. Contains your name, info about you, and a signature of a person who issued the certificate.

ElGamal

RSA

PAP

X.509

509

NEW QUESTION 79
A _____ is a function is not reversible.

Stream cipher

Asymmetric cipher

Hash

Block Cipher

NEW QUESTION 80
With Electronic codebook (ECB) what happens:

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

The cipher text from the current round is XORed with the plaintext from the previous round

The block cipher is turned into a stream cipher

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

NEW QUESTION 81
Which of the following areas is considered a strength of symmetric key cryptography when compared with asymmetric algorithms?

Key distribution

Security

Scalability

Speed

NEW QUESTION 82
A measure of the uncertainty associated with a random variable.

Collision

Whitening

Diffusion

Entropy

NEW QUESTION 83
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?

Hash matrix

Rainbow table

Password table

Hash table

NEW QUESTION 84
What is a TGS?

The server that escrows keys

A protocol for encryption

A protocol for key exchange

The server that grants Kerberos tickets

NEW QUESTION 85
Calculates the average LSB and builds a table of frequencies and Pair of Values. Performs a test on the two tables. It measures the theoretical vs. calculated population difference.

Certificate Authority

Raw Quick Pair

Chi-Square Analysis

SP network