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
Correct Answer :
C. Both a. and b.
Avalanche effect and Completeness are the two characteristic properties of Block ciphers which differ them from stream ciphers.
Related Questions
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
_____ and encryption is two separate cryptographic processes.
Hashing
Decryption
Processing
None of the mentioned 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
Which of the following is /are offered by the Hash functions?
Authentication
Non repudiation
Data Integrity
All of the above
Which of the following are used to create a message digest by the network security protocols?
RSA
SHA-1
DES
MD5
The private key in asymmetric key cryptography is kept by
Sender
Receiver
Sender and receiver
All the connected devices to the network
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
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
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 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
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
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 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
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
_____ and ______ protocol models can be extended to Entangled particles theory.
SARG04 and HTTP
FTP and SSP
SARG04 and SSP
HTTP and FTP
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
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)
What is the output of a cryptographic hash function means?
A variable set of bits
A fixed set of bits, derived from one-way mathematical operations
An output which may be easily discovered by an adversary
Outputs of such functions are of no importance
Digital Signatures authenticates the sender by appending the original message with the ____ digest.
Decrypted message
Encrypted message
Systematic approach
None of the mentioned above
Encryption algorithms are divided into two categories based on the ______.
Output type
Input type
Process type
All of the mentioned above
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
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
The Data Encryption Standard (DES) is an example of a ...
Conventional cryptosystem
Asymmetric cryptosystem
Caesar's cryptosystem
All of these
Decryption is a process to unveil the ______.
Unsecured data
Secured data
Insecure
None of the mentioned above
Cipher in cryptography is
Encrypted message
Algorithm for performing encryption and decryption
Both algorithm for performing encryption and decryption and encrypted message
Decrypted message
Block ciphers accumulate symbols in a message of a ______.
Fixed size
Variable
Integration
All of the mentioned above
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
A mechanism used to encrypt and decrypt data.
Cryptography
Algorithm
Data flow
None of these
Quantum cryptography is the science of exploiting quantum mechanical properties to perform _____.
Cryptographic system
Cryptographic tasks
Decryption system
None of the mentioned 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