A mechanism used to encrypt and decrypt data.
Cryptography
Algorithm
Data flow
None of these
Correct Answer :
A. Cryptography
Cryptography is a mechanism used to encrypt and decrypt data.
Related Questions
The number of rounds in the AES algorithm depends upon the key size being used.Which among the following shows a correct relation between the size of the key used and the number of rounds performed in the AES algorithm?
128 key size: 10 rounds
192 key size: 12 rounds
256 key size: 14 rounds
All of the above
Encryption algorithms are divided into two categories based on the ______.
Output type
Input type
Process type
All of the mentioned above
Which of the following is a mode of operation for the Block ciphers in cryptography?
Electronic Code Book (ECB)
Cipher Block Chaining (CBC)
Counter (CTR) mode
All of the above
You are supposed to use hill cipher for encryption technique. You are provided with the following matrix,
Is the given matrix 'A', a valid key to be used for encryption?
Yes
No
Can't be determined
Data insufficient
Which two principles of quantum mechanics on which quantum cryptography are dependent?
Heisenberg Uncertainty Principle and Photon Polarization Principle.
Fundamental Principle and Bohr's Model Principle
Momentum Principle and Photons Principle
Planck's Principle and Fundamental Principle
The process of decryption of an AES ciphertext is similar to the encryption process in the ______.
Reverse order
Next order
Both A and B
All of the mentioned above
Amongst which of the following is / are true with reference to the rounds in AES
Byte Substitution
Shift Row
Mix Column and Key Addition
All of the mentioned above
Codes and ciphers are different ways to _____ a message.
Encrypt
Decrypt
Both A and B
All of the mentioned above
To encrypt the plaintext, a cryptographic algorithm works in combination with a key...
Word, number, or phrase
Special Symbols
Function Keys
All of these
Which of the following is not a type of symmetric-key cryptography technique?
Caesar cipher
Data Encryption Standard (DES)
Diffie Hellman cipher
Playfair cipher
In the case of symmetric key encryption, the secret key that both the parties possess can be anything such as a _______.
Passcode or a password
Developed code
Network set
None of the mentioned above
How many elements are used in cryptography tools?
1
4
6
3
Hash functions are mathematical functions that transform or map a given set of data into a bit string of fixed size, also known as the hash value.
Hash value
Map value
Both A and B
None of the mentioned above
When do we compare the AES with DES, which of the following functions from DES does not have an equivalent AES function in cryptography?
f function
permutation p
swapping of halves
xor of subkey with function f
Basically, in SHA-512, the message is divided into blocks of size ___ bits for the hash computation.
1024
512
256
1248
International Data Encryption Algorithm (IDEA) was developed by
Xuejia Lai and James Massey
Xuejia Lai and Bruce Schneier
Xuejia Lai and Carlisle Adams
Xuejia Lai and Stafford Tavares
Which of the following options is not correct according to the definition of the Cipher Block Chaining (CBC)?
CBC is a mode of operation for stream ciphers.
Initialization vector (IV) is used in CBC in the initial phase.
It has better resistive nature towards cryptanalysis than ECB
None of the above
Which of the following is the main disadvantage of the ECB (Electronic Code Book)?orWhich of the following is the major drawback of ECB?
It requires large block size
Padding is done to make the plain text divisible into blocks of fixed size
It is prone to cryptanalysis since there is a direct relationship between plain text and cipher text.
None of the above
Which of the following ciphers is a block cipher?
Caesar cipher
Vernam cipher
Playfair cipher
None of the above
How many sub-keys in the total are used by the IDEA for encrypting the plain text into ciphertext?
64 sub- keys
48 sub- keys
52 sub- keys
Only one key and no subkeys
The greatest threat is to public cryptography or asymmetric algorithms used for ____.
Digital signatures and
Key exchange
Both A and B
None of the mentioned above
A cryptographic hash function is an equation used to verify the ____ of data.
Variety
Validity
Veracity
None of the mentioned above
____ is the message or data that can be readable by the sender.
Edited
Main Text
Plain text
All of the mentioned above
Hash functions are used in ___ and have variable levels of complexity and difficulty.
System approach
Cyber safe
Cryptography
None of the mentioned above
The private key in asymmetric key cryptography is kept by
Sender
Receiver
Sender and receiver
All the connected devices to the network
Which of the following security services cannot be achieved using the Hash functions?ORWhich of the following is not possible through hash value?
Password Check
Data Integrity check
Digital Signatures
Data retrieval in its original form
Which one of the following algorithms is not used in asymmetric-key cryptography?
DSA algorithm
Electronic code book algorithm
Diffie-Hellman algorithm
RSA algorithm
Which of the following modes of operation in DES is used for operating?
Cipher Feedback Mode (CFB)
Cipher Block chaining (CBC)
Electronic code book (ECB)
Output Feedback Modes (OFB)
For which of the following should EBC (Electronic Code Book) process not be used for encryption?
For large block sizes
For fixed block sizes
For small block sizes
None of the above
An initialization vector (IV) or starting variable (SV) is a block of bits that is used by several modes to _____.
Randomize the decryption
Randomize the encryption
Minimize and maximize the randomization
None of the mentioned above