WGU C839 INTRO TO CRYPTOGRAPHY 2025 OA
PREPARATION TEST BANK WITH 400 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS
GRADED A+/ C839 PREP FOR OA AND PRE-
ASSESSMENT WTH MOST TESTED QUESTIONS
GRADED A+
WGU C839 – INTRO TO CRYPTOGRAPHY IS A CORE COURSE IN THE CYBERSECURITY DEGREE
PATH THAT COVERS FUNDAMENTALS OF MODERN CRYPTOGRAPHIC TECHNIQUES. THIS
RESOURCE INCLUDES PRACTICE QUESTIONS AND CONCEPT REVIEWS ON ENCRYPTION,
HASHING, AUTHENTICATION, AND DIGITAL SIGNATURES. DESIGNED TO ALIGN WITH THE
2025 OBJECTIVE ASSESSMENT (OA), IT HELPS STUDENTS MASTER TECHNICAL TERMS AND
APPLY CONCEPTS IN REAL-WORLD SECURITY SCENARIOS.
What type of encryption uses different keys to encrypt and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric
D
The most widely used asymmetric encryption algorithm is what?
A RSA
B Vigenere
C DES
D Caesar Cipher
A
A system administrator wants to encrypt a computer hard drive to make sure the contents of the
computer are not readable in case the computer is lost or stolen. The encryption method must be
efficient, scalable, and secure. Which encryption method meets this requirement if the
administrator wants to minimize the impact on the computer's CPU?
A Use of file encryption on all the files on the hard drive
,B Self-encrypting drive
C Trusted platform module
D Hardware security module
C
A developer wants to encrypt an HTML file on his MacBook using an AES encryption. Which
command should the developer run in the terminal to encrypt the HTML file?
A aesencrypt -d filename.html
B aescrypt -e filename.html
C aesencrypt -e filename.html
D aescrypt -d filename.html.aes
B
Which of these hashing methods provides the best method for generating a unique password each
time based on an initial seed value?
A HMAC
B One-time passwords (OTP)
C Salting
D LM hashing
B
A password is typically hashed on Windows and Linux to make it difficult for an intruder to
determine the password. Which method is used in Microsoft Windows to store users' hashed
passwords for computers that connect to an Active Directory domain?
A Bcrypt
B SYSKEY
C NTLMv2
D LM
C
What are the two main applications of public-key encryption?
A Secret-key protection and identity checking
,B Secret and public-key protection
C Data encryption and identity checking
D Data encryption and public-key protection
A
A developer wants to send a system administrator an encrypted email message and uses a system
administrator's email address to generate the public key. Which encryption method is a developer
using in this process?
A Elliptic-curve cryptography
B Knapsack encryption
C Homomorphic encryption
D Identity-based encryption
D
How can you make sure that all the session keys used in client-server key exchange are not
compromised even if the server's long-term encryption key is compromised?
A Elliptic-curve ciphers
B Perfect Forward Secrecy
C PKI
D OpenSSL
B
A developer wants to share a secret key with a system administrator using a public key encryption
method for the key exchange. What is the first step in the process of sending the session key to a
system administrator?
A The system administrator encrypts the session key with the developer's public key.
B The developer sends the system administrator a public key.
C The developer encrypts the session key with the system administrator's public key.
D The system administrator sends the developer a public key.
D
, Which method of authentication involves authenticating only part of the conversation between the
sender and the receiver?
A Two-way authentication
B One-way server authentication
C One-way client authentication
D Intermediate authentication
D
Which system is used to generate digital certificates that could be trusted by both parties?
A Digital certificate reader
B PKI
C Certificate authority
D Digital certificate
B
Which security components are provided by digital signature?
A Integrity, non-repudiation, and proof of origin
B Non-repudiation, integrity, and confidentiality
C Proof of origin, confidentiality, and non-repudiation
D Confidentiality, integrity, and proof of origin
A
Which combination of cryptographic algorithms is used to create digital signatures based on the U.S.
Digital Signature Standards?
A SHA-2 and AES
B SHA-1 and AES
C AES and RSA
D SHA-2 and RSA
D
PREPARATION TEST BANK WITH 400 REAL EXAM
QUESTIONS AND CORRECT VERIFIED ANSWERS
GRADED A+/ C839 PREP FOR OA AND PRE-
ASSESSMENT WTH MOST TESTED QUESTIONS
GRADED A+
WGU C839 – INTRO TO CRYPTOGRAPHY IS A CORE COURSE IN THE CYBERSECURITY DEGREE
PATH THAT COVERS FUNDAMENTALS OF MODERN CRYPTOGRAPHIC TECHNIQUES. THIS
RESOURCE INCLUDES PRACTICE QUESTIONS AND CONCEPT REVIEWS ON ENCRYPTION,
HASHING, AUTHENTICATION, AND DIGITAL SIGNATURES. DESIGNED TO ALIGN WITH THE
2025 OBJECTIVE ASSESSMENT (OA), IT HELPS STUDENTS MASTER TECHNICAL TERMS AND
APPLY CONCEPTS IN REAL-WORLD SECURITY SCENARIOS.
What type of encryption uses different keys to encrypt and decrypt the message?
A Symmetric
B Private key
C Secure
D Asymmetric
D
The most widely used asymmetric encryption algorithm is what?
A RSA
B Vigenere
C DES
D Caesar Cipher
A
A system administrator wants to encrypt a computer hard drive to make sure the contents of the
computer are not readable in case the computer is lost or stolen. The encryption method must be
efficient, scalable, and secure. Which encryption method meets this requirement if the
administrator wants to minimize the impact on the computer's CPU?
A Use of file encryption on all the files on the hard drive
,B Self-encrypting drive
C Trusted platform module
D Hardware security module
C
A developer wants to encrypt an HTML file on his MacBook using an AES encryption. Which
command should the developer run in the terminal to encrypt the HTML file?
A aesencrypt -d filename.html
B aescrypt -e filename.html
C aesencrypt -e filename.html
D aescrypt -d filename.html.aes
B
Which of these hashing methods provides the best method for generating a unique password each
time based on an initial seed value?
A HMAC
B One-time passwords (OTP)
C Salting
D LM hashing
B
A password is typically hashed on Windows and Linux to make it difficult for an intruder to
determine the password. Which method is used in Microsoft Windows to store users' hashed
passwords for computers that connect to an Active Directory domain?
A Bcrypt
B SYSKEY
C NTLMv2
D LM
C
What are the two main applications of public-key encryption?
A Secret-key protection and identity checking
,B Secret and public-key protection
C Data encryption and identity checking
D Data encryption and public-key protection
A
A developer wants to send a system administrator an encrypted email message and uses a system
administrator's email address to generate the public key. Which encryption method is a developer
using in this process?
A Elliptic-curve cryptography
B Knapsack encryption
C Homomorphic encryption
D Identity-based encryption
D
How can you make sure that all the session keys used in client-server key exchange are not
compromised even if the server's long-term encryption key is compromised?
A Elliptic-curve ciphers
B Perfect Forward Secrecy
C PKI
D OpenSSL
B
A developer wants to share a secret key with a system administrator using a public key encryption
method for the key exchange. What is the first step in the process of sending the session key to a
system administrator?
A The system administrator encrypts the session key with the developer's public key.
B The developer sends the system administrator a public key.
C The developer encrypts the session key with the system administrator's public key.
D The system administrator sends the developer a public key.
D
, Which method of authentication involves authenticating only part of the conversation between the
sender and the receiver?
A Two-way authentication
B One-way server authentication
C One-way client authentication
D Intermediate authentication
D
Which system is used to generate digital certificates that could be trusted by both parties?
A Digital certificate reader
B PKI
C Certificate authority
D Digital certificate
B
Which security components are provided by digital signature?
A Integrity, non-repudiation, and proof of origin
B Non-repudiation, integrity, and confidentiality
C Proof of origin, confidentiality, and non-repudiation
D Confidentiality, integrity, and proof of origin
A
Which combination of cryptographic algorithms is used to create digital signatures based on the U.S.
Digital Signature Standards?
A SHA-2 and AES
B SHA-1 and AES
C AES and RSA
D SHA-2 and RSA
D
