How many sub-keys in the total are used by the IDEA for encrypting the plain text into ciphertext?
64 sub- keys
48 sub- keys
52 sub- keys
Only one key and no subkeys
Correct Answer :
C. 52 sub- keys
There are a total of 8 rounds in the IDEA technique for encryption and each of them uses 6 keys. Apart from that, 4 extra keys are used in the final round that is the output transformation round. This gives us a total of 52 subkeys.(8 x 6. + 4 = 52
Related Questions
For which of the following should EBC (Electronic Code Book) process not be used for encryption?
For large block sizes
For fixed block sizes
For small block sizes
None of the 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 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
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.
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Variety
Validity
Veracity
None of the mentioned above
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Pre-Image Resistance
Compression
Fixed Length Output
None of the above
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Cipher Feedback Mode (CFB)
Cipher Block chaining (CBC)
Electronic code book (ECB)
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Independent Decryption Environment Analysis
International Defense Encryption Area
International Data Encryption Algorithm
None 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
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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
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Is the given matrix 'A', a valid key to be used for encryption?
Yes
No
Can't be determined
Data insufficient
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An integer values
A square matrix
An array of characters (i.e. a string)
All of the above
Which of the following ciphers is a block cipher?
Caesar cipher
Vernam cipher
Playfair cipher
None of the above
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Decrypted message
Encrypted message
Systematic approach
None of the mentioned above
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
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
Which of the following is /are offered by the Hash functions?
Authentication
Non repudiation
Data Integrity
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5 similar rounds having 2 pair ; every alternate
9 ; the last
8 ; the first and last
10 ; no
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Hash value
Hash Code
Message Digest
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16 bits
64 bits
32 bits
All of the mentioned above
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The sender sends a photon through a polarizer with randomly assigned polarizations and bit assignment
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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
Post-Quantum Cryptography is a classical cryptographic scheme that is conjectured to be secure against ____.
Quantum adversaries
Quantum integration
Quantum hash
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Previous ciphertext block
Next ciphertext block
Middle ciphertext block
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Each ciphertext block gets 'fed back' into the encryption process
Encrypt the next plaintext block
Both A and B
None of the mentioned above
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Output type
Input type
Process type
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Electronic Code Book (ECB)
Cipher Block Chaining (CBC)
Counter (CTR) mode
All 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
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Unsecured data
Secured data
Insecure
None of the mentioned above
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Message Digest
Message Score
Message Leap
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Encrypt
Decrypt
Both A and B
All of the mentioned above