WGU D334 PA | Intro to Cryptography Questions and
Correct Answers (Graded A+) | New Update 2026/27
1. Describe the significance of the Public Key Cryptography Standard (PKCS) #12 in the
context of X.509 certificates.
PKCS #12 is a standard for creating public keys only.
PKCS #12 is irrelevant to the chain of trust.
PKCS #12 is significant because it allows for the secure storage and transport of
X.509 certificates and their associated private keys.
PKCS #12 is used solely for encrypting data without certificates.
2. If a message is encoded using the Bifid cipher and the grid is altered, how would
this affect the decryption process?
The decryption process would remain unaffected as the Bifid cipher is resilient
to grid changes.
The decryption process would require additional keys for successful decoding.
The decryption process would become faster because of the altered grid.
The decryption process would fail or yield incorrect results due to the mismatch
in the grid used.
3. The Playfair Cipher uses a matrix of size
, 5 x5
7x7
4x4
6 x6
4. In a scenario where a user's private key has been compromised, which certificate
management process should be initiated to ensure key recovery and security?
Hold
Initialization
Issuance
Cancellation
5. Describe the role of the cancellation process in certificate management and how it
relates to key recovery.
The cancellation process involves the initial setup of a certificate authority.
The cancellation process is used to issue new certificates to users.
The cancellation process in certificate management allows for the recovery of
keys when a certificate is no longer valid or has been compromised.
The cancellation process is unrelated to key recovery and focuses on certificate
renewal.
6. What is the definition of "Kasiski examination"?
A method of attacking polyalphabetic substitution ciphers, such as the Vigenère
cipher
, The method of cryptography in which someone chooses a number by which to
shift each letter of a text in the alphabet and substitute the new letter for the
letter being encrypted
A method of using techniques other than brute force to derive a cryptographic
key
An attack in which the attacker tries to decrypt a message by simply applying
every possible key in the keyspace
7. A ______ is a value which only has factors of 1 and itself, and used in areas such as
key exchange and in public key encryption.
Digit
Prime number
Binary
Modulus Operator
8. What is an attribute of RC4 when used with WEP?
128-bit key
256-bit key
40-bit key
512-bit key
9. If a company decides to switch from WPA-Personal to WPA-Enterprise for its
wireless network, what key feature will enhance its security?
, Support for Temporal Key Integrity Protocol
Use of a session key
Use of a 48-bit initialization vector
Support for an authentication server
10. Describe the significance of a root CA signing its certificate with its private key.
The root CA uses its private key to create a backup of the certificate.
Correct Answers (Graded A+) | New Update 2026/27
1. Describe the significance of the Public Key Cryptography Standard (PKCS) #12 in the
context of X.509 certificates.
PKCS #12 is a standard for creating public keys only.
PKCS #12 is irrelevant to the chain of trust.
PKCS #12 is significant because it allows for the secure storage and transport of
X.509 certificates and their associated private keys.
PKCS #12 is used solely for encrypting data without certificates.
2. If a message is encoded using the Bifid cipher and the grid is altered, how would
this affect the decryption process?
The decryption process would remain unaffected as the Bifid cipher is resilient
to grid changes.
The decryption process would require additional keys for successful decoding.
The decryption process would become faster because of the altered grid.
The decryption process would fail or yield incorrect results due to the mismatch
in the grid used.
3. The Playfair Cipher uses a matrix of size
, 5 x5
7x7
4x4
6 x6
4. In a scenario where a user's private key has been compromised, which certificate
management process should be initiated to ensure key recovery and security?
Hold
Initialization
Issuance
Cancellation
5. Describe the role of the cancellation process in certificate management and how it
relates to key recovery.
The cancellation process involves the initial setup of a certificate authority.
The cancellation process is used to issue new certificates to users.
The cancellation process in certificate management allows for the recovery of
keys when a certificate is no longer valid or has been compromised.
The cancellation process is unrelated to key recovery and focuses on certificate
renewal.
6. What is the definition of "Kasiski examination"?
A method of attacking polyalphabetic substitution ciphers, such as the Vigenère
cipher
, The method of cryptography in which someone chooses a number by which to
shift each letter of a text in the alphabet and substitute the new letter for the
letter being encrypted
A method of using techniques other than brute force to derive a cryptographic
key
An attack in which the attacker tries to decrypt a message by simply applying
every possible key in the keyspace
7. A ______ is a value which only has factors of 1 and itself, and used in areas such as
key exchange and in public key encryption.
Digit
Prime number
Binary
Modulus Operator
8. What is an attribute of RC4 when used with WEP?
128-bit key
256-bit key
40-bit key
512-bit key
9. If a company decides to switch from WPA-Personal to WPA-Enterprise for its
wireless network, what key feature will enhance its security?
, Support for Temporal Key Integrity Protocol
Use of a session key
Use of a 48-bit initialization vector
Support for an authentication server
10. Describe the significance of a root CA signing its certificate with its private key.
The root CA uses its private key to create a backup of the certificate.
