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CNT4406 Network Security And Cryptography Midterm/Final Exam – Questions & Answers
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- CRYPTOGRAPHY AND NETWORK SECURITY
CNT4406 Network Security And Cryptography Midterm/Final Exam – Questions & Answers
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CNT4406 Network Security And CryptographyMidterm/Final Exam – Questions & Answers
In the context of a PKI, a(n) ___________ authority operates under the trusted
collaboration of the certificate authority and can be delegated day-to-day
certification functions, such as verifying information about new registrants,
generating end-user keys, revoking certificates, and validating that users
possess a valid certificate. ✔️Ans - registration
The CA periodically distributes a(n) ___________ to all users that identifies all
revoked certificates. ✔️Ans - CRL
A(n) ___________ or cryptosystem is an encryption method or process
encompassing the algorithm, key(s) or cryptovariable(s), and procedures
used to perform encryption and decryption. ✔️Ans - cipher
A ______________ is the information used in conjunction with an algorithm to
create the ciphertext from the plaintext or derive the plaintext from the
ciphertext. ✔️Ans - key
_____________ is the process of converting an original message into a form
that is unreadable to unauthorized individuals. ✔️Ans - Encryption
The process of obtaining the plaintext message from a ciphertext message
without knowing the keys used to perform the encryption is called
______________. ✔️Ans - cryptanalysis
A method of encryption that requires the same secret key to encipher and
decipher the message is known as ___________ encryption. ✔️Ans -
symmetric
_____________ is the entire range of values that can possibly be used to
construct an individual key. ✔️Ans - Keyspace
The ________________ cipher simply rearranges the values within a block to
create the ciphertext. ✔️Ans - transposition/permutation
, What is Diffe-Hellman most commonly used for? ✔️Ans - Symmetric
encryption key exchange
What element in the CIA triad ensures that the data sent is the same data
received? ✔️Ans - Integrity
An X.509 v3 certificate binds a __________, which uniquely identifies a
certificate entity, to a user's public key. ✔️Ans - distinguished name
How many keys exist in a public/private key pair? ✔️Ans - 2
The Secure _____________ Standard issued by the National Institute of
Standards and Technology specifies secure algorithms, such as SHA-1, for
computing a condensed representation of a message or data file. ✔️Ans -
Hash
The ___________ algorithm, developed in 1977, was the first public-key
encryption algorithm published for commercial use. ✔️Ans - RSA
At the World Championships in Athletics in Helsinki in August 2005, a virus
called Cabir infected dozens of ____________, the first time this occurred in a
public setting. ✔️Ans - Bluetooth mobile phones
Netscape developed the ____________________ Layer protocol to use public key
encryption to secure a channel over the public Internet, thus enabling
secure communications. ✔️Ans - Secure Socket
Digital ____________________ are encrypted messages that can be
mathematically proven to be authentic. ✔️Ans - signatures
The successor to 3DES is the ____________________ Encryption Standard.
✔️Ans - Advanced
_________________ is a protocol that can be used to secure communications
across any IP-based network such as LANs, WANs, and the Internet.
✔️Ans - IPSec
_____________ was developed by Phil Zimmerman and uses the IDEA cipher
for message encoding. ✔️Ans - PGP
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