Question 1

Transposition relies on length of password.

Accepted Answer

Transposition relies on rearranging the characters of the password, not its length.

Question 2

Block ciphers operate on blocks of data.

Accepted Answer

Block ciphers encrypt data in fixed-size blocks, typically of 64 or 128 bits, as opposed to stream ciphers that encrypt data one bit or byte at a time.

Question 3

As might be expected,Triple DES is almost three times faster than DES.

Accepted Answer

Triple DES is slower than DES because it applies the DES algorithm three times to each data block, significantly increasing the encryption and decryption time.

Question 4

DSS stands for the United States government's Digital Signature Standard, which is based on the Digital Signature Algorithm (DSA).

Accepted Answer

The Digital Signature Standard (DSS) is indeed based on the Digital Signature Algorithm (DSA) and is a federal standard in the United States for digital signatures.

Question 5

Whether or not encryption is used, the use of password protection is open to various kinds of attack.

Accepted Answer

Password protection, even without encryption, is susceptible to attacks such as brute force, dictionary attacks, phishing, and social engineering, making it a less secure method of protecting information on its own.

Question 6

____ is a change in the position or order of letters or words, as in an anagram.&#10;A)Exchange&#10;B)Substitution&#10;C)Transposition&#10;D)Diffusion

Accepted Answer

Transposition refers to the rearrangement of letters or words from their original sequence to a new position or order, which matches the definition provided in the question.

Question 7

____ is the replacement of a letter or group of letters with another letter or group of letters.&#10;A)Substitution&#10;B)Diffusion&#10;C)Exchange&#10;D)Transposition

Accepted Answer

Substitution involves replacing a letter or group of letters with another letter or group of letters, often used in encryption and coding techniques.

Question 8

____ ciphers use a key stream to encrypt and decrypt a plaintext message.&#10;A)Block&#10;B)Bit&#10;C)Packet&#10;D)Stream

Accepted Answer

Stream ciphers use a key stream to encrypt and decrypt a plaintext message, operating on the data one bit or byte at a time.

Question 9

____ is a method for secure key exchange over an insecure channel based on the nature of photons.&#10;A)Skipjack&#10;B)Quantum cryptography&#10;C)RC4&#10;D)IDEA

Accepted Answer

Quantum cryptography uses the principles of quantum mechanics, specifically the behavior of photons, to secure communication channels. It allows two parties to produce a shared random secret key known only to them, which can then be used to encrypt and decrypt messages, ensuring secure key exchange even over insecure channels.

Question 10

____ attacks use all possible combination of letters, numbers, and special characters to determine the target password.&#10;A)Brute-force&#10;B)Dictionary&#10;C)Hybridization&#10;D)LC5

Accepted Answer

Brute-force attacks systematically check all possible combinations of letters, numbers, and special characters until the correct password is found.

Question 11

____________________ uses an algorithm to encrypt a ciphertext document from a plaintext document, and when the information is needed again, the algorithm is used to decrypt the ciphertext back into plaintext.

Accepted Answer

The answer of ____________________ uses an algorithm to encrypt a...

Question 12

Sometimes called secret key algorithms, ____________________ key algorithms use the same key to encrypt and to decrypt the data.

Accepted Answer

The answer of Sometimes called secret key algorithms, ____________________ key...

Question 13

Also called public key algorithms, ____________________ key algorithms use two keys for encrypting and decrypting data.

Accepted Answer

The answer of Also called public key algorithms, ____________________ key...

Question 14

The ____________________, also known as Rijndael, is a block cipher adopted as an encryption standard by the U.S. government.

Accepted Answer

The answer of The ____________________, also known as Rijndael, is...

Question 15

____________________ is a secure hash algorithm developed in 1992 by Ron Rivest,one of the inventors of RSA.

Accepted Answer

The answer of ____________________ is a secure hash algorithm developed...

Question 16

Briefly describe Enigma.

Accepted Answer

The answer of Briefly describe Enigma....

Question 17

Describe some of the most common terms you need to know when dealing with cryptography.

Accepted Answer

The answer of Describe some of the most common terms...

Question 18

Briefly describe 3DES.

Accepted Answer

The answer of Briefly describe 3DES....

Deck 6: Encryption and Password Cracking