C839 - Pre-Assessment Introduction to Cryptography
Complete Questions and Guide Answers
100% Verified Graded A+
1. Which encryption standard uses the same key to encrypt and decrypt mes- sages?
Answer: Symmetric Key Encryption
2. Which algorithm is designated as a Type 2 product by the National Security Agency
(NSA)?
Answer: SKIPJACK
3. What is the most commonly used format for certificates?
Answer: X.509 v3 *Version 3*
4. What is referenced to determine if a certificate has been revoked?
Answer: Certificate
Revocation List *(CRL)*
5. What needs to be installed on *end users' computers* to allow them to
*trust* applications that have been *digitally signed* by the developer?
, Answer: Sender's
public key *(DEVELOPER's)*
6. Which type of certificate *must be certified by an authority* to verify it with other
participants?
Answer: Public Certificate
7. What is an attribute of the Rivest Cipher 4 (RC4) algorithm?
Answer: It requires a unique nonce.
*(# used ONCE)*
8. Which mode generates the key stream with a nonce and incrementing value?-
Answer: Counter (CTR)
*Generates the next keystream block* by encrypting successive *values* of a "counter"
9. Which mode is a stream algorithm that concatenates an incrementing value with a
nonce?
Answer: Counter (CTR)
10. Which key would an administrator use to encrypt data so *only the CEO can decrypt
it?*
Answer: CEO's public key
Complete Questions and Guide Answers
100% Verified Graded A+
1. Which encryption standard uses the same key to encrypt and decrypt mes- sages?
Answer: Symmetric Key Encryption
2. Which algorithm is designated as a Type 2 product by the National Security Agency
(NSA)?
Answer: SKIPJACK
3. What is the most commonly used format for certificates?
Answer: X.509 v3 *Version 3*
4. What is referenced to determine if a certificate has been revoked?
Answer: Certificate
Revocation List *(CRL)*
5. What needs to be installed on *end users' computers* to allow them to
*trust* applications that have been *digitally signed* by the developer?
, Answer: Sender's
public key *(DEVELOPER's)*
6. Which type of certificate *must be certified by an authority* to verify it with other
participants?
Answer: Public Certificate
7. What is an attribute of the Rivest Cipher 4 (RC4) algorithm?
Answer: It requires a unique nonce.
*(# used ONCE)*
8. Which mode generates the key stream with a nonce and incrementing value?-
Answer: Counter (CTR)
*Generates the next keystream block* by encrypting successive *values* of a "counter"
9. Which mode is a stream algorithm that concatenates an incrementing value with a
nonce?
Answer: Counter (CTR)
10. Which key would an administrator use to encrypt data so *only the CEO can decrypt
it?*
Answer: CEO's public key
