EC-COUNCIL 212-81 Real Exam Questions and Answers FREE [Q65-Q85]

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EC-COUNCIL 212-81 Real Exam Questions and Answers FREE

Exam Dumps 212-81 Practice Free Latest EC-COUNCIL Practice Tests

The EC-COUNCIL 212-81 certification exam is ideal for professionals who are working in the field of IT security, including network administrators, security analysts, and security engineers. The certification is also suitable for individuals who are interested in pursuing a career in IT security and wish to demonstrate their expertise in encryption technologies. The exam is designed to test the candidate’s practical skills and knowledge and is conducted online. Candidates are required to complete 50 multiple-choice questions within 90 minutes. The exam also includes scenario-based questions that test the candidate’s ability to apply their knowledge to real-world situations. Overall, the EC-COUNCIL 212-81 certification exam is an excellent way for professionals to validate their skills and knowledge in encryption technologies and enhance their career prospects.

Q65. If the round function is a cryptographically secure pseudorandom function, then ___________ rounds is sufficient to make the block cipher a pseudorandom permutation.

Q66. Created in 1977 by Ron Rivest, Adi Shamir, and Leonard Adleman at MIT. Most widely used public key cryptography algorithm. Based on relationships with prime numbers. This algorithm is secure because it is difficult to factor a large integer composed of two or more large prime factors.

PKI

DES

RSA

Diffie-Helmann

RSA
https://en.wikipedia.org/wiki/RSA_(cryptosystem)
RSA (Rivest-Shamir-Adleman) is a public-key cryptosystem that is widely used for secure data transmission. It is also one of the oldest. The acronym RSA comes from the surnames of Ron Rivest, Adi Shamir, and Leonard Adleman, who publicly described the algorithm in 1977. An equivalent system was developed secretly, in 1973 at GCHQ (the British signals intelligence agency), by the English mathematician Clifford Cocks. That system was declassified in 1997.
Incorrect answers:
Diffie-Helmann – The first publicly described asymmetric algorithm. A cryptographic protocol that allows two parties to establish a shared key over an insecure channel. Often used to allow parties to exchange a symmetric key through some unsecure medium, such as the Internet. It was developed by Whitfield Diffie and Martin Helmann in 1976.
DES – The Data Encryption Standard is a symmetric-key algorithm for the encryption of digital data. Although its short key length of 56 bits makes it too insecure for applications, it has been highly influential in the advancement of cryptography.
Developed in the early 1970s at IBM and based on an earlier design by Horst Feistel, the algorithm was submitted to the National Bureau of Standards (NBS) following the agency’s invitation to propose a candidate for the protection of sensitive, unclassified electronic government data. In 1976, after consultation with the National Security Agency (NSA), the NBS selected a slightly modified version (strengthened against differential cryptanalysis, but weakened against brute-force attacks), which was published as an official Federal Information Processing Standard (FIPS) for the United States in 1977.
PKI – A public key infrastructure is a set of roles, policies, hardware, software and procedures needed to create, manage, distribute, use, store and revoke digital certificates and manage public-key encryption. The purpose of a PKI is to facilitate the secure electronic transfer of information for a range of network activities such as e-commerce, internet banking and confidential email. It is required for activities where simple passwords are an inadequate authentication method and more rigorous proof is required to confirm the identity of the parties involved in the communication and to validate the information being transferred.

Q67. 3DES can best be classified as which one of the following?

Digital signature

Symmetric algorithm

Asymmetric algorithm

Hashing algorithm

Q68. John works as a cryptography consultant. He finds that people often misunderstand the reality of breaking a cipher. What is the definition of breaking a cipher?

Finding any method that is more efficient than brute force

Uncovering the algorithm used

Rendering the cypher no longer useable

Decoding the key

Q69. Which of the following asymmetric algorithms is described by U.S. Patent 5,231,668 and FIPS 186

AES

RC4

DSA

RSA

Q70. What size block does Skipjack use?

512

128

256

Q71. What is an IV?

Random bits added to a hash

The key used for a cryptography algorith

A fixed size random stream that is added to a block cipher to increase randomeness

The cipher used

Q72. A digital document that contains a public key and some information to allow your system to verify where that key came from. Used for web servers, Cisco Secure phones, E-Commerce.

Registration Authority

Payload

OCSP

Digital Certificate

Q73. 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

Q74. Which of the following algorithms uses three different keys to encrypt the plain text?

Skipjack

AES

Blowfish

3DES

Q75. 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

Q76. Which method of password cracking takes the most time and effort?

Dictionary attack

Shoulder surfing

Brute force

Rainbow tables

Q77. Manipulating individuals so that they will divulge confidential information, rather than by breaking in or using technical cracking techniques.

Linear cryptanalysis

Replay attack

Side-channel attack

Social engineering attack

Q78. 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

Q79. Which of the following is used to encrypt email and create digital signatures?

DES

SHA1

AES

RSA

Q80. Which one of the following is an example of a symmetric key algorithm?

ECC

Diffie-Hellman

RSA

Rijndael

Q81. The time and effort required to break a security measure.

Session Key

Work factor

Non-repudiation

Payload

Q82. 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

Q83. Which of the following is assured by the use of a hash?

Confidentiality

Availability

Authentication

Integrity

Q84. Which of the following Secure Hashing Algorithm (SHA) produces a 160-bit digest from a message with a maximum length of (264-1) bits and resembles the MD5 algorithm?

SHA-0

SHA-2

SHA-1

SHA-3

Q85. Which of the following is the successor of SSL?

GRE

RSA

IPSec

TLS

The certification is ideal for security professionals, network engineers, IT administrators, and anyone who is responsible for securing critical data within their organization. The certification provides a comprehensive understanding of encryption technologies and their application in real-world scenarios. It also validates the candidate’s ability to design and implement secure communication channels.

The ECS certification exam covers a wide range of topics related to encryption, including the basics of encryption, symmetric and asymmetric encryption, hash functions, digital signatures, key management, and more. The exam also covers the different types of encryption algorithms and their applications, as well as the different types of attacks that can be used to compromise encryption systems.

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