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
Correct Answer :
C. CFB (Cipher text Feed Back)
CFB is primarily a mode to derive some characteristics of a stream cipher from a block cipher on the cryptography in cryptoanalysis.
Related Questions
Block ciphers accumulate symbols in a message of a ______.
Fixed size
Variable
Integration
All 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
Cipher in cryptography is
Encrypted message
Algorithm for performing encryption and decryption
Both algorithm for performing encryption and decryption and encrypted message
Decrypted message
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
Amongst which of the following is/ are true with reference to step-by-step breakdown of the process of quantum cryptography,
The sender sends a photon through a polarizer with randomly assigned polarizations and bit assignment
Photon uses a beam splitter that can be horizontal, vertical, or diagonal to decode or read the polarization of each photon
Receiver tells the sender the random assignments of a beam splitter for each photon in the same sequence it was sent
All of the mentioned above
Public key cryptography is a ... cryptosystem
Symmetric
Asymmetric
Symmetric & Asymmetric both
None of these
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 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
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
Conventional cryptography also known as ... encryption.
asymmetric-key
logical-key
symmetric-key
None of these
How many elements are used in cryptography tools?
1
4
6
3
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
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
Codes and ciphers are different ways to _____ a message.
Encrypt
Decrypt
Both A and B
All 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
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 mechanism used to encrypt and decrypt data.
Cryptography
Algorithm
Data flow
None of these
What is the block size of plain text in SHA- 512 algorithm?
512 bits
1024 bits
2048 bits
None of the above
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
Encryption algorithms are divided into two categories based on the ______.
Output type
Input type
Process type
All of the mentioned 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
Decryption is a process to unveil the ______.
Unsecured data
Secured data
Insecure
None of the mentioned above
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 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
In the AES-128 algorithm there are mainly __________ similar rounds and _________ round is different from other round.
5 similar rounds having 2 pair ; every alternate
9 ; the last
8 ; the first and last
10 ; no
Cryptographic hashing provides a barrier to potential _______.
Attackers
Sender
Receiver
None of the mentioned above
A hash function is a _____ that converts a numerical input value into another compressed numerical value.
Abstract view
Mathematical function
Both A and B
None of the mentioned above
When a hash function is used to provide message authentication, the hash function value is called to as:
Message Field
Message Digest
Message Score
Message Leap
Digital Signatures authenticates the sender by appending the original message with the ____ digest.
Decrypted message
Encrypted message
Systematic approach
None of the mentioned above
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