WGU C839 / D334 EXAM QUESTIONS AND ANSWERS | LATEST UPDATE 2026/2027 | GUARANTEED PASS | GRADED A+.

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WGU C839 / D334 EXAM QUESTIONS AND ANSWERS |
LATEST UPDATE 2026/2027 | GUARANTEED PASS |
GRADED A+.

1. Symmetric block ciphers make use of _____ to perform substitution as part
the encryption process.
A. p-boxes
B. s-boxes
C. IVs - correct answer - S-boxes




2. PRESENT is a light-weight symmetric block cipher with a key size of 80 or
128 bits, 32 rounds, and ______ bit block size.
A. 32
B. 64
C. 128 - correct answer - 64




3. ______ cryptography makes use of a key pair (one public, one private) to
perform encryption and decryption. If a given key in a key pair is used for
encryption, only the opposite key in that key pair can perform the reverse
decryption.
A. Symmetric
B. Asymmetric
C. Hash - correct answer - Asymmetric




4. When encrypting data using symmetric cryptography, which key may need
to be exchanged to facilitate decryption?

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A. Secret key
B. Private key
C. Public key - correct answer - Secret key




5. What is the block and key size in bits used by the light-weight symmetric
block cipher CLEFIA?
A. 64 bit blocks; 64 bit keys
B. 64 or 80 bit blocks; 128 bit keys
C. 128 bit blocks; 128, 192, or 256 bit keys - correct answer - 128 bit blocks;
128, 192, or 256 bit keys




6. If Shawn employs public key cryptography to send Sue a digitally signed
message, which key will Sue use to decrypt the message?
A. Sue's private key
B. Shawn's private key
C. Sue's public key - correct answer - Sue's private key




7. _____ is a public key encryption method that is an extension of El Gamal
but adds a one-way hashing method which protects against an adaptive
chosen ciphertext attack.
A. Cramer-Shoup
B. Ephemeral
C. Key Clustering - correct answer - Cramer-Shoup

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8. With _____ encryption, we can perform mathematical operations on
ciphered values i.e., before decryption.
A. Polyalphabetic
B. Homomorphic
C. Quantum - correct answer - Homomorphic




9. Which encoding scheme for x.509 certificates supports Base64 and ASCII
formats?
A. DER
B. PEM
C. MAC - correct answer - PEM




10. If Shawn plans to employ asymmetric cryptography to send Sue a digitally
signed message, which key will Shawn use to sign the message?
A. Sue's private key
B. Shawn's private key
C. Sue's public key - correct answer - Shawn's private key




11. If Shawn employs public key cryptography to send Sue a digitally signed
message, which key will Sue use to verify the message?
A. Sue's private key

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B. Shawn's public key
C. Sue's public key - correct answer - Shawn's public key




12. _____ allows for a new unique passcode to be created for each instance,
based on an initial seed and for a given time period.
A. One Time Passwords (OTP)
B. Hashed One Time Passwords (HOTP)
C. Timed One Time Password (TOTP) - correct answer - TOTP


13. RC5 is a conventional symmetric block cipher that is suitable for
lightweight implementations. It has a variable key size with a max of
_____bits.
A. 128
B. 256
C. 2048 - correct answer - 2048


14. Hashing involves taking a _____ length input and producing a _____ length
output (message digest).
A. fixed; fixed
B. variable; fixed
C. fixed; variable - correct answer - variable; fixed




15. The hash value in bits for SHA-1 is ____.
A. 128
B. 160
C. 256 - correct answer - 160