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WGU C839 INTRO TO CRYPTOGRAPHY EXAM 2024 ACTUAL EXAM AND PRE ASSESSMENT EXAM COMPLETE 500 QUESTIONS WITH DETAILED VERIFIED ANSWERS (100% CORRECT ANSWERS) /ALREADY GRADED A+€15,79
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C839 - Intro to Cryptography - Pre-Assessment & Vocabulary
1. Which encryption standard uses the same key to B
encrypt and decrypt messages?
A Asymmetric Key Encryption
B Symmetric Key Encryption
C Public Certificate
D CRL
2. Which algorithm is designated as a Type 2 product by C
the National Security Agency (NSA)?
A DES
B AES
C SKIPJACK
D WEP
3. What is the most commonly used format for certifi- B
cates?
A X.509 v2
B X.509 v3
C sha-1
D sha-2
4. What is referenced to determine if a certificate has A
been revoked?
A Certificate Revocation List
B Certificate Revocation Authority
C Certificate Approver
D Revocation List
5. What needs to be installed on end users' computers A
to allow them to trust applications that have been
digitally signed by the developer?
A Sender's public key
B Sender's private key
, C839 - Intro to Cryptography - Pre-Assessment & Vocabulary
C Receiver's public key
D Receiver's private key
6. Which type of certificate must be certified by an au- A
thority to verify it with other participants?
A Public Certificate
B Private Certificate
C Certificate Provider
D Revocation Authority
7. What is an attribute of the Rivest Cipher 4 (RC4) C
algorithm?
A It performs CRC after every iteration
B Salting is performed.
C It requires a unique nonce.
D It does not require a unique nonce.
8. Which mode generates the key stream with a nonce D
and incrementing value?
A Certificate Revocation List (CRL)
B Nonce mode
C Rivest Cipher 4 (RC4)
D Counter (CTR)
9. Which mode is a stream algorithm that concatenates C
an incrementing value with a nonce?
A CAT
B Nonce
C Counter (CTR)
D RC4
10. Which key would an administrator use to encrypt data A
so only the CEO can decrypt it?
A CEO's public key
B CEO's private key
, C839 - Intro to Cryptography - Pre-Assessment & Vocabulary
C Administrator's private key
D Administrator's public key
11. What is the result of a hash function? D
A RC4
B Public key
C decryption
D Digest
12. What is used to efficiently encrypt large files? C
A Asymmetric Encryption
B Hashing
C Symmetric Encryption
D RC4
13. An administrator needs to encrypt the following word A. hvxfirgb
with the Atbash cipher:
Remember this
security is a Mono-Al-
phabet Substitu-
Which ciphertext is correct? tion Cipher that re-
places each char-
A hvxfirgb acter with its cor-
B hemfirjc responding alpha-
C hexfirgc bet character IE:
D hyxfigrb A=Z, B=Y, C=X,
etc...
14. Which cryptographic algorithm has a 128-bit HASH B
size?
A Secure Hash Algorithm 1 (SHA-1)
B Message Digest Algorithm 5 (MD5)
C Triple Data Encryption Standard (3DES)
D Advanced Encryption Standard (AES)
15. Which characteristic makes a hashing function suit- B. Collision resis-
able for use in signature schemes? tance
, C839 - Intro to Cryptography - Pre-Assessment & Vocabulary
A Collision detection Of the many
B Collision resistance properties that a
C Collision avoidance good hash func-
D Signature verification tion should have,
the one that is
mentioned most
often is collision
resistance.
16. Which attribute of a hashing function makes a birth- C. Partial-mes-
day attack possible? sage collision
A Worm infiltration The partial-mes-
B Out of date encryption sage collision at-
C Partial-message collision tacks all rely on
D Collision detection birthday attacks
17. Which hash algorithm produces a 160-bit output val- C
ue?
A MD5
B DES
C SHA-1
D SHA-160
18. What does cipher block chaining (CBC) use with the A
key to encrypt subsequent blocks of plaintext?
A Previous generated ciphertext
B Previous generated plaintext
C Two blocks of plaintext
D Secondary block of plaintext
19. Which mode produces the same ciphertext from two A. Electronic
identical plaintext blocks? codebook (ECB)
A Electronic codebook (ECB) There are many
B DES situations in which
large blocks of
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