212-81시험최신인증시험기출문제

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CES 시험은 암호화 알고리즘, 대칭 및 비대칭 키 관리, 디지털 인증서 등 다양한 주제를 다룹니다. 이 시험은 안전한 통신 프로토콜, 암호 분석, 키 관리 최적 사례 등 중요한 주제도 다룹니다. 시험은 후보자의 지식과 암호화 기술을 적용하여 데이터를 이동 및 정지 상태에서 보호하는 능력을 테스트하도록 설계되었습니다.

EC-Council 212-81 (Certified Encryption Specialist) 시험은 암호화 분야에서 자신의 전문 지식을 입증하려는 개인을 위해 설계된 전문 인증입니다. 이 시험은 암호화, 데이터 암호화 및 암호 해독 기술을 포함한 암호화의 핵심 개념에 중점을 둡니다. IT 보안 분석가, 네트워크 보안 관리자 및 보안 컨설턴트를 포함하여 사이버 보안 산업에서 일하는 전문가에게 이상적인 인증입니다.

212-81시험

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최신 ECES 212-81 무료샘플문제 (Q160-Q165):

질문 # 160
A _________ is a digital representation of information that identifies you as a relevant entity by a trusted third party.

  • A. Ownership stamp
  • B. Digest
  • C. Hash
  • D. Digital Signature

정답:D

설명:
Digital Signature
https://en.wikipedia.org/wiki/Digital_signature
A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. A valid digital signature, where the prerequisites are satisfied, gives a recipient very strong reason to believe that the message was created by a known sender (authentication), and that the message was not altered in transit (integrity).


질문 # 161
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.

  • A. IDEA
  • B. RSA
  • C. CAST
  • D. DES

정답:A

설명:
IDEA
https://en.wikipedia.org/wiki/International_Data_Encryption_Algorithm
In cryptography, the International Data Encryption Algorithm (IDEA), originally called Improved Proposed Encryption Standard (IPES), is a symmetric-key block cipher designed by James Massey of ETH Zurich and Xuejia Lai and was first described in 1991. The algorithm was intended as a replacement for the Data Encryption Standard (DES). IDEA is a minor revision of an earlier cipher Proposed Encryption Standard (PES).
The cipher was designed under a research contract with the Hasler Foundation, which became part of Ascom-Tech AG. The cipher was patented in a number of countries but was freely available for non-commercial use. The name "IDEA" is also a trademark. The last patents expired in 2012, and IDEA is now patent-free and thus completely free for all uses.
IDEA was used in Pretty Good Privacy (PGP) v2.0 and was incorporated after the original cipher used in v1.0, BassOmatic, was found to be insecure. IDEA is an optional algorithm in the OpenPGP standard.
Incorrect answers:
CAST - symmetric algorithm. Created in 1996 by Carlisle Adams and Stafford Tavares. Operates on 64 bit blocks and has a key size of 40-128 bits. Typically used in GPG and PGP. Encryption is either 12 or 16 rounds.
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.
RSA - 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


질문 # 162
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?

  • A. Complex mathematics to conceal a message
  • B. Changing a message so it can only be easily read by the intended recipient
  • C. Changing a message using complex mathematics
  • D. Applying keys to a message to conceal it

정답:B

설명:
Changing a message so it can only be easily read by the intended recipient
https://en.wikipedia.org/wiki/Encryption
Encryption is the process of encoding information. This process converts the original representation of the information, known as plaintext, into an alternative form known as ciphertext. Ideally, only authorized parties can decipher a ciphertext back to plaintext and access the original information. Encryption does not itself prevent interference but denies the intelligible content to a would-be interceptor.


질문 # 163
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.

  • A. Digital Certificate
  • B. OCSP
  • C. Payload
  • D. Registration Authority

정답:A

설명:
Digital Certificate
https://en.wikipedia.org/wiki/Public_key_certificate
A public key certificate, also known as a digital certificate or identity certificate, is an electronic document used to prove the ownership of a public key. The certificate includes information about the key, information about the identity of its owner (called the subject), and the digital signature of an entity that has verified the certificate's contents (called the issuer).
Incorrect answers:
OCSP - Provides certificate validation in real time and will let you know if it is valid or has been revoked.
Registration Authority (RA) - component of PKI that validates the identity of an entity requesting a digital certificate.
Payload - In computing and telecommunications, the payload is the part of transmitted data that is the actual intended message. Headers and metadata are sent only to enable payload delivery. In the steganography - information to be concealed and sent secretly, or the data covertly communicated;


질문 # 164
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.

  • A. RC4
  • B. GOST
  • C. ECB
  • D. CFB

정답:C

설명:
ECB
https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation
The simplest of the encryption modes is the electronic codebook (ECB) mode (named after conventional physical codebooks). The message is divided into blocks, and each block is encrypted separately.
The disadvantage of this method is a lack of diffusion. Because ECB encrypts identical plaintext blocks into identical ciphertext blocks, it does not hide data patterns well. ECB is not recommended for use in cryptographic protocols.
ECB mode can also make protocols without integrity protection even more susceptible to replay attacks, since each block gets decrypted in exactly the same way.
Incorrect answers:
RC4 - stream symmetric cipher that was created by Ron Rivest of RSA. Used in SSL and WEP.
GOST - the GOST block cipher (Magma), defined in the standard GOST 28147-89 (RFC 5830), is a Soviet and Russian government standard symmetric key block cipher with a block size of 64 bits. The original standard, published in 1989, did not give the cipher any name, but the most recent revision of the standard, GOST R 34.12-2015, specifies that it may be referred to as Magma. The GOST hash function is based on this cipher. The new standard also specifies a new 128-bit block cipher called Kuznyechik.
CFB - the process wherein the ciphertext block is encrypted then the ciphertext produced is XOR'd back with the plaintext to produce the current ciphertext block.


질문 # 165
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