[2022] Use Valid New 212-81 Test Notes & 212-81 Valid Exam Guide [Q39-Q54]

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[2022] Use Valid New 212-81 Test Notes & 212-81 Valid Exam Guide

212-81 Actual Questions Answers PDF 100% Cover Real Exam Questions

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	Steganography Implementations Example of Symmetric Stream Ciphers: RC4
Topic 3	Server-based Certificate Validation Protocol Classification of Random Number Generator
Topic 4	Introduction and History of Cryptography Breaking the Vigenère Cipher
Topic 5	Cracking Modern Cryptography Example of Symmetric Stream Ciphers: PIKE
Topic 6	Propagating Cipher-Block Chaining (PCBC) Naor-Reingold and Mersenne Twister Pseudorandom Function
Topic 7	Information Theory Cryptography Concepts Multi-Alphabet Substitution

NEW QUESTION 39
Which of the following is a block cipher?

AES

RC4

RSA

NEW QUESTION 40
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.

Chi Square

Enigma Machine

Cipher Disks

Scytale Cipher

NEW QUESTION 41
Which of the following is not a key size used by AES?

128 bits

192 bits

256 bits

512 b

NEW QUESTION 42
Which of the following is an asymmetric algorithm related to the equation y^2 = x^3 + Ax + B?

Blowfish

Elliptic Curve

AES

RSA

NEW QUESTION 43
How can rainbow tables be defeated?

Lockout accounts under brute force password cracking attempts

All uppercase character passwords

Use of non-dictionary words

Password salting

NEW QUESTION 44
Which algorithm was U. S. Patent 5,231,668, filed on july 26, 1991, attributed to David W. Kravitz, and adopted by the U. S. government in 1993 with FIPS 186?

DSA

AES

RC4

RSA

NEW QUESTION 45
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

NEW QUESTION 46
Symmetric algorithm. Designed by James Massey and Xuejia Lai. Operates on 64 bit blocks and has a 128 bit key. Consists of 8 identical transformations each round and an output transformation.

IDEA

RSA

CAST

DES

NEW QUESTION 47
Which one of the following is an authentication method that sends the username and password in cleartext?

PAP

CHAP

Kerberos

SPAP

NEW QUESTION 48
Which one of the following best describes a process that splits the block of plaintext into two separate blocks, then applies the round function to one half, and finally swaps the two halves?

Block ciphers

Symmetric cryptography

Feistel cipher

Substitution cipher

NEW QUESTION 49
A ______ refers to a situation where two different inputs yield the same output.

Convergence

Collision

Transposition

Substitution

NEW QUESTION 50
WPA2 uses AES for wireless data encryption at which of the following encryption levels?

128 bit and CRC

128 bi and TKIP

128 bit and CCMP

64 bit and CCMP

NEW QUESTION 51
A symmetric block cipher designed in 1993 by Bruce Schneier. Was intended as a replacement for DES. Like DES it is a 16 round Feistel working on 64bit blocks. Can have bit sizes 32bits to 448bits.

Skipjack

Blowfish

MD5

Serpent

NEW QUESTION 52
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 53
What is a “Collision attack” in cryptography?

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

NEW QUESTION 54
The reverse process from encoding – converting the encoded message back into its plaintext format.

Substitution

Whitening