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WorksheetsCryptography
Total questions: 15
Worksheet time: 8mins
What is an important disadvantage of using a public key algorithm compared to a symmetric algorithm?
Asymmetric algorithm provides better access control.
Asymmetric algorithm is a faster process.
Asymmetric algorithm provides nonrepudiation of delivery.
Asymmetric algorithm is more difficult to implement.
When a user needs to provide message integrity, what options may be best?
Send a digital signature of the message to the recipient
Encrypt the message with a symmetric algorithm and send it
Encrypt the message with a private key so the recipient can decrypt with
the corresponding public key
Create a checksum, append it to the message, encrypt the message, then
send to recipient.
The two methods of encrypting data are?
Substitution and transposition
Block and stream
Symmetric and asymmetric
DES and AES
Cryptography supports all of the core principles of information security except
Availability
Confidentiality
Integrity
Authenticity
The only cipher system said to be unbreakable by brute force is
AES
DES
One-time pad
Triple DES
Data that is in an unencrypted form is referred to as which of the following?
plain text
crypt text
cleartext
simpletext
In which type of encryption is the same key used to encrypt and decrypt data?
public
asymmetric
symmetric
private
What alternative term can be used to describe asymmetric cryptographic algorithms?
public key cryptography
user key cryptography
private key cryptography
cipher-text cryptography
What type of cryptography uses two keys on both ends i.e a private and a public key?
shared
asymmetric
symmetric
open
Plaintext
original message
coded message
algorithm for transforming plaintext to ciphertext
info used in cipher known only to sender/receiver
ciphertext
field of both cryptography and cryptanalysis
study of encryption principles/methods
converting plaintext to ciphertext
coded message
cryptanalysis
field of both cryptography and cryptanalysis
study of encryption principles/methods
study of principles/methods of deciphering ciphertext without knowing key
converting plaintext to ciphertext
Non-repudiation
Ensure message remains secret during transmission between parties
Ensure message is not altered while in transit between communicating partners
Verifies sender is who she says she is
Proves that nobody but on sender could have sent a particular message
cryptology
coded message
original message
recovering ciphertext from plaintext
field of both cryptography and cryptanalysis
cryptography
study of principles/methods of deciphering ciphertext without knowing key
study of encryption and decryption principles and methods
field of both cryptography and cryptanalysis
coded message
