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
Correct Answer :
A. Hash value
Hash functions are mathematical functions that transform or map a given collection of data into a bit string of defined length, which is referred to as the hash value. Hash functions are used in cryptography. A hash value is the result of converting plaintext or ciphertext to hash value. Any kind of data can be transformed into a particular text string using hashing, which is a cryptographic approach.
Related Questions
What is the block size of plain text in SHA- 512 algorithm?
512 bits
1024 bits
2048 bits
None of the 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
Which of the following cipher techniques include the involvement of matrix operations in their algorithms of encryption and decryption?
Hill Cipher
Playfair cipher
Both a and b
None of the above
Which of the following options is not correct according to the definition of the Hash Function?
Hash Functions are mathematical functions
They compress the input values
The hash functions work on arbitrary length input but produces fixed length output.
None of the above
With symmetric key algorithms, the ____ key is used for the encryption and decryption of data.
Different
Same
Both A and B
None of the mentioned above
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
Which of the following are used to create a message digest by the network security protocols?
RSA
SHA-1
DES
MD5
Which of the following properties are the characteristic properties of a block cipher technique which differs from stream cipher?
Avalanche effect
Completeness
Both a. and b.
None of the above
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
With reference to Cipher Feedback (CFB) Mode, amongst which of the following is /are true,
Each ciphertext block gets 'fed back' into the encryption process
Encrypt the next plaintext block
Both A and B
None 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
_____ and encryption is two separate cryptographic processes.
Hashing
Decryption
Processing
None of the mentioned above
Which is the cryptographic protocol that is used to protect an HTTP connection?
Resource reservation protocol
SCTP
TLS
ECN
Digital Signatures authenticates the sender by appending the original message with the ____ digest.
Decrypted message
Encrypted message
Systematic approach
None of the mentioned 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
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
Block ciphers accumulate symbols in a message of a ______.
Fixed size
Variable
Integration
All of the mentioned above
The Data Encryption Standard (DES) is an example of a ...
Conventional cryptosystem
Asymmetric cryptosystem
Caesar's cryptosystem
All of these
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
Cipher block chaining or CBC is an advancement made on _____.
Electronic Code Book
Decrypted code
System engineering
All of the mentioned 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
All the below-stated processes are performed in the AES (Advanced Encryption Standard) Algorithm. Which of the following process(s) are not performed in the final round of the AES?
a) Substitution bytes
b) Shift rows
c) Mix columns
d) Add round key
Options
i.
iii.
All of the mentioned
None of the mentioned
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
The private key in asymmetric key cryptography is kept by
Sender
Receiver
Sender and receiver
All the connected devices to the network
Which possible Attacks in Quantum Cryptography can take place?
Possible Attacks in Quantum Cryptography and Birthday Attack
Birthday attack and Boomerang attack
Brute force attack and Faked-State-Attack
Possible Attacks in Quantum Cryptography and Faked-State Attack
Cipher in cryptography is
Encrypted message
Algorithm for performing encryption and decryption
Both algorithm for performing encryption and decryption and encrypted message
Decrypted message
How many elements are used in cryptography tools?
1
4
6
3
The above steps are performed in each round of which of the following ciphers?
Rail fence cipher
Data Encryption Standard (DES)
Advance Encryption Standard (AES)
None of the above
What does IDEA stand for in the world of cryptography?orThe IDEA word in the IDEA algorithm is the abbreviation for which of the following?
Independent Decryption Environment Analysis
International Defense Encryption Area
International Data Encryption Algorithm
None of the above