WGU C839 QUESTIONS AND CORRECT DETAILED
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED
A+||BRAND NEW
Symmetric Ans✓✓✓ Which encryption standard uses the same key to
encrypt and decrypt messages?
Skipjack Ans✓✓✓ Which algorithm is designated as a Type 2 product
by the National Security Agency (NSA)?
X.509 v3 Ans✓✓✓ What is the most commonly used format for
certificates?
Certificate revocation list (CRL) Ans✓✓✓ What is referenced to
determine if a certificate has been revoked?
Sender's public key Ans✓✓✓ What needs to be installed on end users'
computers to allow them to trust applications that have been digitally
signed by the developer?
Public Certificate Ans✓✓✓ Which type of certificate must be certified
by an authority to verify it with other participants?
It requires a unique nonce. Ans✓✓✓ What is an attribute of the Rivest
Cipher 4 (RC4) algorithm?
,Counter (CTR) Ans✓✓✓ Which mode generates the key stream with a
nonce and incrementing value?
Counter (CTR) Ans✓✓✓ Which mode is a stream algorithm that
concatenates an incrementing value with a nonce?
CEO's public key Ans✓✓✓ Which key would an administrator use to
encrypt data so only the CEO can decrypt it?
Digest Ans✓✓✓ What is the result of a hash function?
Symmetric encryption Ans✓✓✓ What is used to efficiently encrypt
large files?
hvxfirgb Ans✓✓✓ An administrator needs to encrypt the following
word with the Atbash cipher: security What is the correct ciphertext?
Message Digest Algorithm 5 (MD5) Ans✓✓✓ Which cryptographic
algorithm has a 128-bit hash size?
Collision resistance Ans✓✓✓ Which characteristic makes a hashing
function suitable for use in signature schemes?
, Partial-message collision Ans✓✓✓ Which attribute of a hashing
function makes a birthday attack possible?
SHA-1 Ans✓✓✓ Which hash algorithm produces a 160-bit output
value?
Previous generated ciphertext Ans✓✓✓ What does cipher block
chaining (CBC) use with the key to encrypt subsequent blocks of
plaintext?
Electronic codebook (ECB) Ans✓✓✓ Which mode produces the same
ciphertext from two identical plaintext blocks?
Electronic codebook (ECB) Ans✓✓✓ Which encryption mode is least
secure?
P = E (K,C) Ans✓✓✓ What is the mathematical formula used for
symmetric decryption?
Rivest-Shamir-Adleman Ans✓✓✓ Which algorithm relies on factoring
the product of large prime numbers?
Pretty Good Privacy (PGP) Ans✓✓✓ Which encryption technology is a
serial combination of hashing, data compression, symmetric-key
ANSWERS (VERIFIED ANSWERS) |ALREADY GRADED
A+||BRAND NEW
Symmetric Ans✓✓✓ Which encryption standard uses the same key to
encrypt and decrypt messages?
Skipjack Ans✓✓✓ Which algorithm is designated as a Type 2 product
by the National Security Agency (NSA)?
X.509 v3 Ans✓✓✓ What is the most commonly used format for
certificates?
Certificate revocation list (CRL) Ans✓✓✓ What is referenced to
determine if a certificate has been revoked?
Sender's public key Ans✓✓✓ What needs to be installed on end users'
computers to allow them to trust applications that have been digitally
signed by the developer?
Public Certificate Ans✓✓✓ Which type of certificate must be certified
by an authority to verify it with other participants?
It requires a unique nonce. Ans✓✓✓ What is an attribute of the Rivest
Cipher 4 (RC4) algorithm?
,Counter (CTR) Ans✓✓✓ Which mode generates the key stream with a
nonce and incrementing value?
Counter (CTR) Ans✓✓✓ Which mode is a stream algorithm that
concatenates an incrementing value with a nonce?
CEO's public key Ans✓✓✓ Which key would an administrator use to
encrypt data so only the CEO can decrypt it?
Digest Ans✓✓✓ What is the result of a hash function?
Symmetric encryption Ans✓✓✓ What is used to efficiently encrypt
large files?
hvxfirgb Ans✓✓✓ An administrator needs to encrypt the following
word with the Atbash cipher: security What is the correct ciphertext?
Message Digest Algorithm 5 (MD5) Ans✓✓✓ Which cryptographic
algorithm has a 128-bit hash size?
Collision resistance Ans✓✓✓ Which characteristic makes a hashing
function suitable for use in signature schemes?
, Partial-message collision Ans✓✓✓ Which attribute of a hashing
function makes a birthday attack possible?
SHA-1 Ans✓✓✓ Which hash algorithm produces a 160-bit output
value?
Previous generated ciphertext Ans✓✓✓ What does cipher block
chaining (CBC) use with the key to encrypt subsequent blocks of
plaintext?
Electronic codebook (ECB) Ans✓✓✓ Which mode produces the same
ciphertext from two identical plaintext blocks?
Electronic codebook (ECB) Ans✓✓✓ Which encryption mode is least
secure?
P = E (K,C) Ans✓✓✓ What is the mathematical formula used for
symmetric decryption?
Rivest-Shamir-Adleman Ans✓✓✓ Which algorithm relies on factoring
the product of large prime numbers?
Pretty Good Privacy (PGP) Ans✓✓✓ Which encryption technology is a
serial combination of hashing, data compression, symmetric-key
