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下載Certified Encryption Specialist考試題庫
NEW QUESTION 36
You are studying classic ciphers. You have been examining the difference between single substitution and multi-substitution. Which one of the following is an example of a multi-alphabet cipher?
- A. Atbash
- B. Rot13
- C. Vigenere
- D. Caesar
Answer: C
Explanation:
Vigenere
https://en.wikipedia.org/wiki/Vigen%C3%A8re_cipher
The Vigenere cipher is a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution.
First described by Giovan Battista Bellaso in 1553, the cipher is easy to understand and implement, but it resisted all attempts to break it until 1863, three centuries later. This earned it the description le chiffre indechiffrable (French for ‘the indecipherable cipher’). Many people have tried to implement encryption schemes that are essentially Vigenere ciphers. In 1863, Friedrich Kasiski was the first to publish a general method of deciphering Vigenere ciphers.
NEW QUESTION 37
Which one of the following is an example of a symmetric key algorithm?
- A. RSA
- B. Diffie-Hellman
- C. Rijndael
- D. ECC
Answer: C
Explanation:
Rijndael
https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
The Advanced Encryption Standard (AES), also known by its original name Rijndael. The algorithm described by AES is a symmetric-key algorithm, meaning the same key is used for both encrypting and decrypting the data.
Incorrect answers:
ECC – Elliptic-curve cryptography is an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields. ECC allows smaller keys compared to non-EC cryptography (based on plain Galois fields) to provide equivalent security.
Diffie-Hellman – key exchange is a method of securely exchanging cryptographic keys over a public channel and was one of the first public-key protocols as conceived by Ralph Merkle and named after Whitfield Diffie and Martin Hellman.
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.
NEW QUESTION 38
A technique used to increase the security of block ciphers. It consists of steps that combine the data with portions of the key (most commonly using a simple XOR) before the first round and after the last round of encryption.
- A. Whitening
- B. Key Exchange
- C. Key Schedule
- D. Key Clustering
Answer: A
Explanation:
Whitening
https://en.wikipedia.org/wiki/Key_whitening
In cryptography, key whitening is a technique intended to increase the security of an iterated block cipher. It consists of steps that combine the data with portions of the key.
The most common form of key whitening is xor-encrypt-xor — using a simple XOR before the first round and after the last round of encryption.
The first block cipher to use a form of key whitening is DES-X, which simply uses two extra 64-bit keys for whitening, beyond the normal 56-bit key of DES. This is intended to increase the complexity of a brute force attack, increasing the effective size of the key without major changes in the algorithm. DES-X’s inventor, Ron Rivest, named the technique whitening.
Incorrect answers:
Key Clustering – different encryption keys generated the same ciphertext from the same plaintext message.
Key Schedule – an algorithm for the key that calculates the subkeys for each round that the encryption goes through.
Key Exchange – a method in cryptography by which cryptographic keys are exchanged between two parties, allowing use of a cryptographic algorithm.
NEW QUESTION 39
Which of the following areas is considered a strength of symmetric key cryptography when compared with asymmetric algorithms?
- A. Key distribution
- B. Security
- C. Speed
- D. Scalability
Answer: C
Explanation:
Speed
Symmetric key systems are considerably faster than asymmetric key systems but have issues with proper key distribution, controlling keys as more users need to communicate, and cannot provide non-repudiation or authenticity.
NEW QUESTION 40
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?
- A. Blowfish
- B. Serpent
- C. Twofish
- D. Skipjack
Answer: D
Explanation:
Skipjack
https://en.wikipedia.org/wiki/Clipper_chip
The Clipper chip was a chipset that was developed and promoted by the United States National Security Agency (NSA) as an encryption device that secured “voice and data messages” with a built-in backdoor that was intended to “allow Federal, State, and local law enforcement officials the ability to decode intercepted voice and data transmissions.”. It was intended to be adopted by telecommunications companies for voice transmission. Introduced in 1993, it was entirely defunct by 1996.
he Clipper chip used a data encryption algorithm called Skipjack to transmit information and the Diffie-Hellman key exchange-algorithm to distribute the cryptokeys between the peers. Skipjack was invented by the National Security Agency of the U.S. Government; this algorithm was initially classified SECRET, which prevented it from being subjected to peer review from the encryption research community. The government did state that it used an 80-bit key, that the algorithm was symmetric, and that it was similar to the DES algorithm. The Skipjack algorithm was declassified and published by the NSA on June 24, 1998. The initial cost of the chips was said to be $16 (unprogrammed) or $26 (programmed), with its logic designed by Mykotronx, and fabricated by VLSI Technology, Inc (see the VLSI logo on the image on this page).
NEW QUESTION 41
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