C839 - Intro To Cryptography
- Study Prep test questions
and answers
Which encryption standard uses the same key to encrypt and
decrypt messages?
A) Asymmetric Key Encryption
B) Symmetric Key Encryption
C) Public Certificate
D) CRL
B
Which algorithm is designated as a Type 2 product by the National
Security Agency (NSA)?
A) DES
B) AES
C) SKIPJACK
D) WEP
C
What is the most commonly used format for certificates?
A) X.509 v2
B) X.509 v3
C) sha-1
D) sha-2
B
What is referenced to determine if a certificate has been revoked?
A) Certificate Revocation List
B) Certificate Revocation Authority
C) Certificate Approver
D) Revocation List
A
,What needs to be installed on end users' computers to allow them
to trust applications that have been digitally signed by the
developer?
A) Sender's public key
B) Sender's private key
C) Receiver's public key
D) Receiver's private key
A
Which type of certificate must be certified by an authority to verify
it with other participants?
A) Public Certificate
B) Private Certificate
C) Certificate Provider
D) Revocation Authority
A
What is an attribute of the Rivest Cipher 4 (RC4) 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.
C
Which mode generates the key stream with a nonce and
incrementing value?
A) Certificate Revocation List (CRL)
B) Nonce mode
C) Rivest Cipher 4 (RC4)
D) Counter (CTR)
D
Which mode is a stream algorithm that concatenates an
incrementing value with a nonce?
A) CAT
B) Nonce
,C) Counter (CTR)
D) RC4
C
Which key would an administrator use to encrypt data so only the
CEO can decrypt it?
A) CEO's public key
B) CEO's private key
C) Administrator's private key
D) Administrator's public key
A
What is the result of a hash function?
A) RC4
B) Public key
C) decryption
D) Digest
D
What is used to efficiently encrypt large files?
A) Asymmetric Encryption
B) Hashing
C) Symmetric Encryption
D) RC4
C
An administrator needs to encrypt the following word with the
Atbash cipher:
security
Which ciphertext is correct?
A) hvxfirgb
B) hemfirjc
C) hexfirgc
D) hyxfigrb
A
, Which cryptographic algorithm has a 128-bit HASH 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)
B
Which characteristic makes a hashing function suitable for use in
signature schemes?
A) Collision detection
B) Collision resistance
C) Collision avoidance
D) Signature verification
B
Which attribute of a hashing function makes a birthday attack
possible?
A) Worm infiltration
B) Out of date encryption
C) Partial-message collision
D) Collision detection
C
Which hash algorithm produces a 160-bit output value?
A) MD5
B) DES
C) SHA-1
D) SHA-160
C
What does cipher block chaining (CBC) use with the 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
A
- Study Prep test questions
and answers
Which encryption standard uses the same key to encrypt and
decrypt messages?
A) Asymmetric Key Encryption
B) Symmetric Key Encryption
C) Public Certificate
D) CRL
B
Which algorithm is designated as a Type 2 product by the National
Security Agency (NSA)?
A) DES
B) AES
C) SKIPJACK
D) WEP
C
What is the most commonly used format for certificates?
A) X.509 v2
B) X.509 v3
C) sha-1
D) sha-2
B
What is referenced to determine if a certificate has been revoked?
A) Certificate Revocation List
B) Certificate Revocation Authority
C) Certificate Approver
D) Revocation List
A
,What needs to be installed on end users' computers to allow them
to trust applications that have been digitally signed by the
developer?
A) Sender's public key
B) Sender's private key
C) Receiver's public key
D) Receiver's private key
A
Which type of certificate must be certified by an authority to verify
it with other participants?
A) Public Certificate
B) Private Certificate
C) Certificate Provider
D) Revocation Authority
A
What is an attribute of the Rivest Cipher 4 (RC4) 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.
C
Which mode generates the key stream with a nonce and
incrementing value?
A) Certificate Revocation List (CRL)
B) Nonce mode
C) Rivest Cipher 4 (RC4)
D) Counter (CTR)
D
Which mode is a stream algorithm that concatenates an
incrementing value with a nonce?
A) CAT
B) Nonce
,C) Counter (CTR)
D) RC4
C
Which key would an administrator use to encrypt data so only the
CEO can decrypt it?
A) CEO's public key
B) CEO's private key
C) Administrator's private key
D) Administrator's public key
A
What is the result of a hash function?
A) RC4
B) Public key
C) decryption
D) Digest
D
What is used to efficiently encrypt large files?
A) Asymmetric Encryption
B) Hashing
C) Symmetric Encryption
D) RC4
C
An administrator needs to encrypt the following word with the
Atbash cipher:
security
Which ciphertext is correct?
A) hvxfirgb
B) hemfirjc
C) hexfirgc
D) hyxfigrb
A
, Which cryptographic algorithm has a 128-bit HASH 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)
B
Which characteristic makes a hashing function suitable for use in
signature schemes?
A) Collision detection
B) Collision resistance
C) Collision avoidance
D) Signature verification
B
Which attribute of a hashing function makes a birthday attack
possible?
A) Worm infiltration
B) Out of date encryption
C) Partial-message collision
D) Collision detection
C
Which hash algorithm produces a 160-bit output value?
A) MD5
B) DES
C) SHA-1
D) SHA-160
C
What does cipher block chaining (CBC) use with the 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
A
