Basically, in SHA-512, the message is divided into blocks of size ___ bits for the hash computation.
1024
512
256
1248
Correct Answer :
A. 1024
As we study, the message is divided into blocks of size 1024 bits, and the output produced is a 512-bit message digest and uses the 512-bit buffer till 80 rounds.
Related Questions
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
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 Hash Function takes an input of arbitrary length and converts it into a fixed length output.Which of the following names can we use for denoting the output of the hash function?
Hash value
Hash Code
Message Digest
All of the above
Codes and ciphers are different ways to _____ a message.
Encrypt
Decrypt
Both A and B
All of the mentioned above
Basically, in SHA-512, the message is divided into blocks of size ___ bits for the hash computation.
1024
512
256
1248
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
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)
Quantum cryptography is the science of exploiting quantum mechanical properties to perform _____.
Cryptographic system
Cryptographic tasks
Decryption system
None of the mentioned above
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
Which of the following modes of operations can be followed for both stream ciphers as well as block ciphers?
CBC (Cipher Block Chaining)
ECB (Electronic Code Book)
CFB (Cipher text Feed Back)
All of the above
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
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
Study with quantum computers of future being expected to solve the discrete logarithmic problem and the popularly know cryptography methods such as AES, RSA, DES, quantum cryptography becomes which solution?
Quantum Solution
Foreseen Solution
Cryptographic Solution
Block Cipher Solution
____ is the message or data that can be readable by the sender.
Edited
Main Text
Plain text
All of the mentioned above
Which is the cryptographic protocol that is used to protect an HTTP connection?
Resource reservation protocol
SCTP
TLS
ECN
What is the full-form of RSA in the RSA encryption technique?
Round Security Algorithm
Rivest, Shamir, Adleman
Robert, Shamir, Addie
None of the above
ElGamal encryption system is an asymmetric key encryption algorithm.
Public-key cryptography
Private-key cryptography
Both
None of these
Cipher Feedback Mode is given as feedback to the ____ of encryption with some new specifications.
Next block
Previous block
Middle block
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 ciphers is a block cipher?
Caesar cipher
Vernam cipher
Playfair cipher
None of the above
Which of the following security attacks is not an active attack? ORWhich of the following attacks is a passive attack?
Masquerade
Modification of message
Denial of service
Traffic analysis
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
Among the following given options, chose the strongest encryption technique?
DES ( Data Encryption Standard)
Double DES
Triple DES
AES (Advance Encryption Standard)
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
_____ and encryption is two separate cryptographic processes.
Hashing
Decryption
Processing
None of the mentioned above
RSA algorithm is ____ cryptography algorithm.
Systematic
Symmetric
Asymmetric
None of the mentioned above
The DES (Data Encryption Standard) cipher follows the fiestal structure. Which of the following properties are not shown by the fiestal structure?
The input text is divided into two parts: one being left half and another one being right half.
Swapping of the left and right halves are performed after each round.
The plain text is converted into a matrix form first
None of the above
The private key in asymmetric key cryptography is kept by
Sender
Receiver
Sender and receiver
All the connected devices to the network
Data encryption standard is a block cipher and encrypts data in blocks of size of _____ each.
16 bits
64 bits
32 bits
All of the mentioned above
Which of the following cannot be chosen as a key in the Caesar cipher?
An integer
An alphabet (A-Z or a-z)
A string
None of the above