D 334 Pre-Assessment (Latest Update
) Introduction to Cryptography
Questions with Answers {Grade A} 100%
Correct (Verified Answers) - WGU
One-time pad - correct answer is considered to be unbreakable since it only uses its
cipher code once.
Pseudo-Random Number Generators (PRNGs) - correct answer This method repeats
the random numbers after a given time (periodic). They are fast and are also
deterministic and are useful in producing a repeatable set of random numbers.
Frequency Analysis - correct answer is cipher cracking methodology that involves
identifying patterns and variations in the probability of codes. i.e. a three-letter
ciphered text combination spotted at the beginning of a string too often could tip us
off that those three letters correlate the letters THE in the English alphabet.
True Random Number Generators (TRNGs) - correct answer This method generates a
true random number and uses some form of random process. One approach is to
monitor the movements of a mouse pointer on a screen or from the pauses between
keystrokes. Overall, the method is generally slow, especially if it involves human
interaction, but is non-deterministic and aperiodic.
Entropy - correct answer measures level of unpredictability; in encryption relates to
the degree of uncertainty of the encryption process.
ASCII - correct answer 8-bit values, up to 256 characters
, D 334 Pre-Assessment (Latest Update
) Introduction to Cryptography
Questions with Answers {Grade A} 100%
Correct (Verified Answers) - WGU
UTF-16 - correct answer 16- bit values, up to 65,536 characters
Hardware vs Software encryption - correct answer Hardware encryption is more
efficient than software encryption.
XOR the following
0101110101010111
1001100000111010
-------------------- correct answer 1100010101101101
asymmetric key-based encryption
-typical methods - correct answer RSA
DSA
El Gamal
Symmetric key-based encryption
-Typical Methods - correct answer RC2- 40 bit key size 64 bit block
RC4- (Stream Cipher)- Used in SSL and WEP
RC5- (Variable Key size, 32, 64, or 128 bit block size)
AES- (128, 192 or 256 bit key size, 128 bit block size)
DES- (56 bit key size. 64 bit Block size)
, D 334 Pre-Assessment (Latest Update
) Introduction to Cryptography
Questions with Answers {Grade A} 100%
Correct (Verified Answers) - WGU
3DES- (112 bit key size, 64 bit block size)
Block Encryption - correct answer RC2(40 bit key size)
RC5(Variable block size)
IDEA
DES
3DES
AES (Rijndael)
Blowfish
twofish
stream encryption - correct answer RC4
Chacha
Rainbow Attack - correct answer The method of knowing the mapping between the
hashed values and the original data
Dictionary-type attack - correct answer a brute force analysis
∉ - correct answer does not belong to
when an object is not in a set
, D 334 Pre-Assessment (Latest Update
) Introduction to Cryptography
Questions with Answers {Grade A} 100%
Correct (Verified Answers) - WGU
∈ - correct answer Belongs to
when an object is within a set
⊆ - correct answer subset
subset has fewer elements or equal to the set
A ∪ B - correct answer union (objects that belong to set A or set B)
| such that
A ∩ B Intersection: in both A and B
Enigma Machine -Cypher 10 - correct answer Used a polyalphabetic substitution
cipher, which did not repeat within a reasonable time period, along with a secret key.
For the cracking of the Enigma cipher, the challenge was thus to determine both the
algorithm used and the key. Enigma's main weakness, though, was that none of the
plain text letters could be ciphered as itself.
Four-square cipher9 - correct answer Uses four 5 × 5 matrices arranged in a square,
are where each matrix contains 25 letters for encoding and decoding operations.
) Introduction to Cryptography
Questions with Answers {Grade A} 100%
Correct (Verified Answers) - WGU
One-time pad - correct answer is considered to be unbreakable since it only uses its
cipher code once.
Pseudo-Random Number Generators (PRNGs) - correct answer This method repeats
the random numbers after a given time (periodic). They are fast and are also
deterministic and are useful in producing a repeatable set of random numbers.
Frequency Analysis - correct answer is cipher cracking methodology that involves
identifying patterns and variations in the probability of codes. i.e. a three-letter
ciphered text combination spotted at the beginning of a string too often could tip us
off that those three letters correlate the letters THE in the English alphabet.
True Random Number Generators (TRNGs) - correct answer This method generates a
true random number and uses some form of random process. One approach is to
monitor the movements of a mouse pointer on a screen or from the pauses between
keystrokes. Overall, the method is generally slow, especially if it involves human
interaction, but is non-deterministic and aperiodic.
Entropy - correct answer measures level of unpredictability; in encryption relates to
the degree of uncertainty of the encryption process.
ASCII - correct answer 8-bit values, up to 256 characters
, D 334 Pre-Assessment (Latest Update
) Introduction to Cryptography
Questions with Answers {Grade A} 100%
Correct (Verified Answers) - WGU
UTF-16 - correct answer 16- bit values, up to 65,536 characters
Hardware vs Software encryption - correct answer Hardware encryption is more
efficient than software encryption.
XOR the following
0101110101010111
1001100000111010
-------------------- correct answer 1100010101101101
asymmetric key-based encryption
-typical methods - correct answer RSA
DSA
El Gamal
Symmetric key-based encryption
-Typical Methods - correct answer RC2- 40 bit key size 64 bit block
RC4- (Stream Cipher)- Used in SSL and WEP
RC5- (Variable Key size, 32, 64, or 128 bit block size)
AES- (128, 192 or 256 bit key size, 128 bit block size)
DES- (56 bit key size. 64 bit Block size)
, D 334 Pre-Assessment (Latest Update
) Introduction to Cryptography
Questions with Answers {Grade A} 100%
Correct (Verified Answers) - WGU
3DES- (112 bit key size, 64 bit block size)
Block Encryption - correct answer RC2(40 bit key size)
RC5(Variable block size)
IDEA
DES
3DES
AES (Rijndael)
Blowfish
twofish
stream encryption - correct answer RC4
Chacha
Rainbow Attack - correct answer The method of knowing the mapping between the
hashed values and the original data
Dictionary-type attack - correct answer a brute force analysis
∉ - correct answer does not belong to
when an object is not in a set
, D 334 Pre-Assessment (Latest Update
) Introduction to Cryptography
Questions with Answers {Grade A} 100%
Correct (Verified Answers) - WGU
∈ - correct answer Belongs to
when an object is within a set
⊆ - correct answer subset
subset has fewer elements or equal to the set
A ∪ B - correct answer union (objects that belong to set A or set B)
| such that
A ∩ B Intersection: in both A and B
Enigma Machine -Cypher 10 - correct answer Used a polyalphabetic substitution
cipher, which did not repeat within a reasonable time period, along with a secret key.
For the cracking of the Enigma cipher, the challenge was thus to determine both the
algorithm used and the key. Enigma's main weakness, though, was that none of the
plain text letters could be ciphered as itself.
Four-square cipher9 - correct answer Uses four 5 × 5 matrices arranged in a square,
are where each matrix contains 25 letters for encoding and decoding operations.
