Digital Signatures authenticates the sender by appending the original message with the ____ digest.
Decrypted message
Encrypted message
Systematic approach
None of the mentioned above
Correct Answer :
B. Encrypted message
A digital signature verifies the identity of the sender by attaching the original message together with the encrypted message digest to the end of the message. The sender encrypts the message using the private key in order to assure nonrepudiation, while the hash safeguards against data tampering and ensures integrity, as shown in the equation: digital signature=private sender's key (hash (message).
Related Questions
Cryptographic hashing provides a barrier to potential _______.
Attackers
Sender
Receiver
None of the mentioned above
Security Goals of Cryptography are
Confidentiality
Authenticityn
Data integrityn
All of these
Block ciphers accumulate symbols in a message of a ______.
Fixed size
Variable
Integration
All of the mentioned 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
Cipher block chaining or CBC is an advancement made on _____.
Electronic Code Book
Decrypted code
System engineering
All of the mentioned above
What is the output of the N 1024-bit blocks from the Nth stage in this?
512 bits
1024 bits
N x 1024bits
N x 512 bits
RSA algorithm is ____ cryptography algorithm.
Systematic
Symmetric
Asymmetric
None of the mentioned above
We are provided the plain text SUN. You need to convert the given plain text into ciphertext under the Ceasar cipher encryption technique. Which of the following options is the correct ciphertext for the given text if the key is 2?
UWP
NUS
WUP
QSL
Amongst which of the following is/ are showing the goodness of electronic code book,
Parallel encryption of blocks of bits is possible
It is a faster way of encryption.
Simple way of the block cipher.
All of the mentioned 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
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
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
In Cipher block chaining mode, the current plaintext block is added to the ____.
Previous ciphertext block
Next ciphertext block
Middle ciphertext block
None of the mentioned 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
Encryption algorithms are divided into two categories based on the ______.
Output type
Input type
Process type
All of the mentioned 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
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
Amongst which of the following is /are good for Hashes,
Password protection
Data integrity / file verification
Digital signatures and virus signatures
All 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 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
Post-Quantum Cryptography is a classical cryptographic scheme that is conjectured to be secure against ____.
Quantum adversaries
Quantum integration
Quantum hash
None of the mentioned above
Which of the following ciphers uses asymmetric key cryptography?
Rail Fence Cipher
Data Encryption Standard (DES)
Diffie Hellman Cipher
None of the 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
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
_____ and ______ protocol models can be extended to Entangled particles theory.
SARG04 and HTTP
FTP and SSP
SARG04 and SSP
HTTP and FTP
Public key cryptography is a ... cryptosystem
Symmetric
Asymmetric
Symmetric & Asymmetric both
None of these
Decryption is a process to unveil the ______.
Unsecured data
Secured data
Insecure
None of the mentioned above
Which is the cryptographic protocol that is used to protect an HTTP connection?
Resource reservation protocol
SCTP
TLS
ECN
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