A key is a string of bits used by a cryptographic algorithm to transform plain text into ciphertext. Which of the following is capable of becoming a key in a cryptographic algorithm?
An integer values
A square matrix
An array of characters (i.e. a string)
All of the above
Correct Answer :
D. All of the above
As the key can be any string of bits, all the mentioned options are capable of becoming a key in a cryptographic algorithm.
Related Questions
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 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
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
The private key in asymmetric key cryptography is kept by
Sender
Receiver
Sender and receiver
All the connected devices to the network
Which of the following options correctly defines the Brute force attack?
Brutally forcing the user to share the useful information like pins and passwords.
Trying every possible key to decrypt the message.
One entity pretends to be some other entity
The message or information is modified before sending it to the receiver.
Which of the following ciphers uses asymmetric key cryptography?
Rail Fence Cipher
Data Encryption Standard (DES)
Diffie Hellman Cipher
None of the above
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
Basically, in SHA-512, the message is divided into blocks of size ___ bits for the hash computation.
1024
512
256
1248
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
Which of the following are used to create a message digest by the network security protocols?
RSA
SHA-1
DES
MD5
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 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
Among the following given options, chose the strongest encryption technique?
DES ( Data Encryption Standard)
Double DES
Triple DES
AES (Advance Encryption Standard)
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
Block ciphers accumulate symbols in a message of a ______.
Fixed size
Variable
Integration
All of the mentioned 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
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
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 is /are offered by the Hash functions?
Authentication
Non repudiation
Data Integrity
All of the above
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
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 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
Cryptographic hashing provides a barrier to potential _______.
Attackers
Sender
Receiver
None of the mentioned above
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
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
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
Digital Signatures authenticates the sender by appending the original message with the ____ digest.
Decrypted message
Encrypted message
Systematic approach
None of the mentioned above
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
Security Goals of Cryptography are
Confidentiality
Authenticityn
Data integrityn
All of these