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

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? A. Secret key P a g e | 2 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 8. With _____ encryption, we can perform mathematical operations on ciphered values i.e., before decryption. P a g e | 3 A. Polyalphabetic B. Homomorphic C. Quantum - correct answer - Homomorphic 9. _____ 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 10. 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 11. Which encoding scheme for x.509 certificates supports Base64 and ASCII formats? A. DER B. PEM C. MAC - correct answer - PEM 12. 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 P a g e | 4 C. Sue's public key - correct answer - Shawn's private key 13. 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 B. Shawn's public key C. Sue's public key - correct answer - Shawn's public key 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 16. The hash value in bits for MD4 is ____. A. 128 B. 160 C. 256 - correct answer - 128 P a g e | 5 17. IPSec ______ mode involves "end-to-end" encryption; i.e. data remains encrypted from the time it leaves a sender's device to the time it arrives at the receiver's device. A. Tunnel B. Transport C. Trusted - correct answer - Transport 18. IPSec ______ mode involves encryption from gateway to gateway, i.e. just through the public network space. A. Tunnel B. Transport C. Trusted - correct answer - Tunnel 19. The hash value in bits for MD5 is ____. A. 128 B. 160 C. 256 - correct answer - 128