EC-COUNCIL 212-81 VOLVES DE EXAMEN DE PRÁCTICOS-PASS EX EXPERMOS DE CUCTRIMIENTO DE CERTIVO EC-CONVICIO (ECES)

Posted by: Martina Comments: 0 Post Date: septiembre 21, 2022

Martina2022-09-21T08:44:59+00:00

La certificación de Especialista en Cifrado Certificado por el Consejo EC (ECES) viene con innumerables beneficios profesionales, presenta a profesionales y estudiantes en el campo de la criptografía. Los participantes aprenderán los fundamentos de la criptografía simétrica y clave moderna, incluidos los detalles de algoritmos como Feistel Networks, DES y AES. La aprobación del examen 212-81 para tener éxito en la certificación real del especialista en cifrado de consumo EC-Consejo (ECES) se puede garantizar con los vertederos de exámenes de práctica 212-81. Los vertederos de exámenes de práctica EC-Council 212-81 de Realexam.es es muy beneficioso para prepararse para el examen rápidamente. Especialista en cifrado certificado por el Consejo EC (ECES) 212-81 La demostración de examen gratuita está a continuación:

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1. What is the basis for the FISH algorithm?

The Lagged Fibonacci generator

Prime number theory

Equations that describe an ellipse

The difficulty in factoring numbers

2. Which of the following is the standard for digital certificates?

RFC 2298

509

CRL

3. 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

4. You have been tasked with selecting a digital certificate standard for your company to use .

Which one of the following was an international standard for the format and information contained in a digital certificate?

509

CRL

RFC 2298

5. 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

6. Which of the following is required for a hash?

Not vulnerable to a brute force attack

Few collisions

Must use SALT

Not reversible

Variable length input, fixed length output

Minimum key length

7. Jane is looking for an algorithm to ensure message integrity .

Which of following would be an acceptable choice?

RSA

AES

RC4

SHA-1

8. When learning algorithms, such as RSA, it is important to understand the mathematics being used. In RSA, the number of positive integers less than or equal to some number is critical in key generation. The number of positive integers less than or equal to n that are coprime to n is called ______.

Mersenne's number

Fermat's number

Euler's totient

Fermat's prime

9. You are explaining the details of the AES algorithm to cryptography students. You are discussing the derivation of the round keys from the shared symmetric key.

The portion of AES where round keys are derived from the cipher key using Rijndael's key schedule is called what?

The key expansion phase

The round key phase

The bit shifting phase

The initial round

10. Changing some part of the plain text for some matching part of cipher text. Historical algorithms typically use this.

Decoding

Substitution

Transposition

Collision

Page 2 of 6

11. 1. What size block does AES work on?

128

192

256

12. Which analysis type is based on the statistics of the numbers of unique colors and close-color pairs in a 24-bit image, a method that analyzes the pairs of colors created by LSB embedding?

Differential Analysis

Discrete Cosine Transform

Raw Quick Pair

Chi squared analysis

13. What is Kerchoff's principle?

A minimum of 15 rounds is needed for a Feistel cipher to be secure

Only the key needs to be secret, not the actual algorithm

Both algorithm and key should be kept secret

A minimum key size of 256 bits is necessary for security

14. In a Feistel cipher, the two halves of the block are swapped in each round .

What does this provide?

Diffusion

Confusion

Avalanche

Substitution

15. Which of the following is generally true about key sizes?

Larger key sizes increase security

Key size is irrelevant to security

Key sizes must be more than 256 bits to be secure

Smaller key sizes increase security

16. Which of the following algorithms uses three different keys to encrypt the plain text?

Skipjack

AES

Blowfish

3DES

17. Protocol suite provides a method of setting up a secure channel for protected data exchange between two devices.

CLR

OCSP

TLS

IPSec

18. What does the OCSP protocol provide?

Revoked certificates

Hashing

VPN connectivity

Encryption

19. Which of the following are valid key sizes for AES (choose three)?

192

256

128

512

20. During the process of encryption and decryption, what keys are shared?

Public keys

Public and private keys

User passwords

Private keys

Page 3 of 6

21. John is responsible for VPNs at his company. He is using IPSec because it has two different modes. He can choose the mode appropriate for a given situation .

What are the two modes of IPSec? (Choose two)

Encrypt mode

Transport mode

Tunnel mode

Decrypt mode

22. DES has a key space of what?

2^128

2^192

2^64

2^56

23. Which one of the following are characteristics of a hash function? (Choose two)

Requires a key

One-way

Fixed length output

Symmetric

Fast

24. Software for maintaining an on-the-fly-encrypted volume. Data is automatically encrypted right before it is saved, then decrypted right after it is loaded, all w/o user intervention.

VPN

PGP

Cryptool

VeraCrypt

25. Cylinder tool. Wrap leather around to decode. The diameter is the key. Used in 7th century BC by greek poet Archilochus.

Cipher disk

Caesar cipher

Scytale

Enigma machine

26. Which of the following would be the fastest.

RSA

AES

27. 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

28. Frank is trying to break into an encrypted file… He is attempting all the possible keys that could be used for this algorithm.

Attempting to crack encryption by simply trying as many randomly generated keys as possible is referred to as what?

Rainbow table

Frequency analysis

Brute force

Kasiski

29. What best describes the shifting of each letter a fixed number of spaces to the left or right?

Single substitution

Multi substitution

XOR

Bit shifting

30. The Clipper chip is notable in the history of cryptography for many reasons. First, it was designed for civilian used secure phones. Secondly, it was designed to use a very specific symmetric cipher .

Which one of the following was originally designed to provide built-in cryptography for the Clipper chip?

Blowfish

Twofish

Skipjack

Serpent

Page 4 of 6

31. Which one of the following is an algorithm that uses variable length key from 1 to 256 bytes, which constitutes a state table that is used for subsequent generation of pseudorandom bytes and then a pseudorandom string of bits, which is XORed with the plaintext to produce the ciphertext?

PIKE

Twofish

RC4

Blowfish

32. 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

33. Juanita is attempting to hide some text into a jpeg file. Hiding messages inside another medium is referred to as which one of the following?

Cryptography

Steganalysis

Cryptology

Steganography

34. In 1977 researchers and MIT described what asymmetric algorithm?

RSA

AES

35. Which of the following is a type of encryption that has two different keys. One key can encrypt the message and the other key can only decrypt it?

Block cipher

Asymmetric

Symmetric

Stream cipher

36. The reverse process from encoding - converting the encoded message back into its plaintext format.

Substitution

Whitening

Encoding

Decoding

37. Which one of the following is a component of the PKI?

TGS

OCSP

TGT

38. Which of the following is the successor of SSL?

GRE

RSA

IPSec

TLS

39. A _________ is a digital representation of information that identifies you as a relevant entity by a trusted third party.

Digital Signature

Hash

Ownership stamp

Digest

40. Encryption of the same plain text with the same key results in the same cipher text. Use of an IV that is XORed with the first block of plain text solves this problem.

CFB

GOST

ECB

RC4

Page 5 of 6

41. Original, unencrypted information is referred to as ____.

text

plaintext

ciphertext

cleartext

42. Which of the following areas is considered a strength of symmetric key cryptography when compared with asymmetric algorithms?

Key distribution

Security

Scalability

Speed

43. Created by D. H. Lehmer. It is a classic example of a Linear congruential generator. A PRNG type of linear congruential generator (LCG) that operates in multiplicative group of integers modulo n. The basic algorithm is Xi+1=(aXi + c) mod m, with 0 Xi m.

Lehmer Random Number Generator

Lagged Fibonacci Generator

Linear Congruential Generator

Blum Blum Shub

44. A simple algorithm that will take the initial key and from that generate a slightly different key each round.

Key Schedule

Feistel Network

SHA-2

Diffie-Helman

45. Hash. Created by Ronald Rivest. Replaced MD4. 128 bit output size, 512 bit block size, 32 bit word size, 64 rounds. Infamously compromised by Flame malware in 2012.

Keccak

MD5

SHA-1

TIGER

46. Which algorithm implements an unbalanced Feistel cipher?

Skipjack

RSA

3DES

Blowfish

47. What is a variation of DES that uses a technique called Key Whitening?

Blowfish

DESX

3DES

AES

48. This is a 128 bit hash that is specified by RFC 132 1. It was designed by Ron Rivest in 1991 to replace an earlier hash function.

SHA1

SHA-256

RSA

MD5

49. Which service in a PKI will vouch for the identity of an individual or company?

KDC

CBC

50. 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

Page 6 of 6

51. The most common way steganography is accomplished is via which one of the following?

rsb

Isb

msb

asb

52. A protocol for key aggreement based on Diffie-Hellman. Created in 1995. Incorporated into the public key standard IEEE P1363.

Blum Blum Shub

Elliptic Curve

Menezes-Qu-Vanstone

Euler's totient

53. Which of the following acts as a verifier for the certificate authority?

Certificate Management system

Directory management system

Registration authority

Certificate authority

54. A _____ is a function that takes a variable-size input m and returns a fixed-size string.

Feistel

Asymmetric cipher

Symmetric cipher

Hash

55. RFC 1321 describes what hash?

RIPEMD

GOST

SHA1

MD5

56. Which of the following is a protocol for exchanging keys?

AES

RSA

57. The mode makes a block cipher into a synchronous stream cipher. It generates keystream blocks, which are then XORed with the plaintext blocks to get the ciphertext.

Cipher-block chaining (CBC)

Electronic codebook (ECB)

Output feedback (OFB)

Cipher feedback (CFB)

58. A cryptanalysis success where the attacker discovers additional plain texts (or cipher texts) not previously known.

Total Break

Distinguishing Algorithm

Instance Deduction

Information Deduction

EC-COUNCIL 212-81 VOLVES DE EXAMEN DE PRÁCTICOS-PASS EX EXPERMOS DE CUCTRIMIENTO DE CERTIVO EC-CONVICIO (ECES)

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