DES follows_________.
1.SP Networks
2.Feistel Cipher Structure
3.Caesars Cipher
4.Hash Algorithm
How many round keys are generated in the AES algorithm?
1. 12
2.11
3.10
4.8
In AES the 4×4 bytes matrix key is transformed into a keys of size __________.
1. 60 words
2.32 words
3.52 words
4. 44 words
In an RSA system the public key of a given user is e = 31, n = 3599. What is the privatekey of this user?
1.1023
2.2432
3.2412
4.3031
In the DES algorithm the Round Input is 32 bits, which is expanded to 48 bits via____________.
1.Addition of ones
2. Addition of zeros
3.Duplication of the existing bits
4.Scaling of the existing bits
In the DES algorithm the round key is __________ bit and the Round Input is ____________bits.
1.48, 32
2.32, 32
3.56, 24
4.64,32
Perform encryption on the following PT using RSA and find the CT. p = 11; q = 13;M = 7.
1. 78
2.45
3.124
4.25
Perform encryption on the following PT using RSA and find the CT. p = 3; q = 11; M= 5.
1.18
2.12
3.26
4.28
The DES Algorithm Cipher System consists of ____________rounds (iterations) each with a round key.
1. 16
2.9
3.12
4.18
What is the block size in the Simplified AES algorithm?
1.36 bits
2.16 bits
3.40 bits
4. 8 bits
Which mode requires the implementation of only the encryption algorithm?
1.OF
2.B CTR
3.CBC
4.ECB
Which of the following modes of operation does not involve feedback?
1.OF
2.B CTR
3.CBC
4.ECB
. What is the block size in the Simplified AES algorithm?
1. 36 bits
2.16 bits
3.40 bits
4.8 bits
By using ______________ you can diminish the chance of data leakage.
1.Steganography
2.Chorography
3.Tomography
4.Cryptography
Compute private key (d, p, q) given public key (e=23, n=233 ´ 241=56,153).
1. 32432
2.19367
3.12543
4.35212
For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where Ciphermessage=11 and thus find the plain text.
1.122
2.143
3.111
4.88
For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where PT message=88and thus find the CT.
1.64
2.11
3.64
4.23
For p = 11 and q = 19 and choose d=17. Apply RSA algorithm where Cipher message=80 and thus find the plain text.
1.5
2.12
3.43
4.54
For p = 11 and q = 19 and choose e=17. Apply RSA algorithm where message=5 andfind the cipher text.
1.C=23
2. C=56
3.C=92
4. C=80
For the AES-128 algorithm there are __________ similar rounds and _________ roundis different.
1.9 ; the last
2. 8 ; the first and last
3.10 ; no
4.2 pair of 5 similar rounds ; every alternate
How many computation rounds does the simplified AES consists of?
1.10
2.8
3.2
4.5
How many rounds does the AES-192 perform?
1.16
2.12
3.14
4.10
How many step function do Round 1 and 2 each have in S-AES?
1.1 and 4
2.3 and 4
3.Both 4
4.4 and 3
In RSA, Ф(n) = _______ in terms of p and q.
1.(p+1)(q+1)
2.(p-1)(q-1)
3. (p)(q)
4.(p)/(q)
In the RSA algorithm, we select 2 random large values ‘p’ and ‘q’. Which of the following is the property of ‘p’ and ‘q’?
1.p/q should give no remainder
2.p and q should be prime
3.p and q should be co-prime
4.p and q should be divisible by Ф(n)
n = 35; e = 5; C = 10. What is the plaintext (use RSA)?
1.2
2.4
3.5
4.6
On comparing AES with DES, which of the following functions from DES does not have an equivalent AES function?
1.Permutation P
2.Swapping of halves
3.XOR of subkey with function f
4.F function
People will normally think it as a normal/regular file and your secret message will pass on without any _____________
1. Cracking
2.Decryption
3.Suspicion
4.Encryption
Perform encryption on the following PT using RSA and find the CT. p = 5; q = 11; M= 9.
1.43
2.14
3.112
4. 54
Perform encryption on the following PT using RSA and find the CT. p = 7; q = 11; M= 8.
1.58
2.34
3.123
4.57
RSA is also a stream cipher like Merkel-Hellman.
1.True
2.False
3.none
4. all
The 4×4 byte matrices in the AES algorithm are called_____
1. Permutations
2.Transitions
3.Words
4.States
The DES algorithm has a key length of ______.
1. 16 Bits
2.32 Bits
3.64 Bits
4.128 Bits
The Initial Permutation table/matrix is of size _____.
1.4×8
2.8×8
3.12×8
4.16×8
The inverse transformation matrix times the forward transformation matrix equals the identity matrix.
1. True
2.False
3.none
4.all
The main motive for using steganography is that hackers or other users can hide a secret message behind a ______________.
1.Program file
2.Special file
3. Ordinary file
4. Encrypted file
The number of unique substitution boxes in DES after the 48 bit XOR operationare___.
1.4
2.8
3.12
4.16
The S-Box is used to provide confusion, as it is dependent on the unknown key.
1.True
2.False
3.none
4. all
There is an addition of round key before the start of the AES round algorithms.
1.True
2.False
3.none
4.All of the mentioned
What is the expanded key size of AES-192?
1.60 words
2.32 words
3.52 words
4.44 words
What is the key size in the S-AES algorithm?
1.32 bits
2.24 bits
3. 16 bits
4.None of the mentioned
What is the number of possible 3 x 3 affine cipher transformations?
1.840
2.168
3.1344
4.1024
Which algorithm among- MARS, Blowfish, RC6, Rijndael and Serpent -was chosen asthe AES algorithm?
1.Rijndael
2.RC6
3.Blowfish
4.MARS
Which block mode limits the maximum throughput of the algorithm to the reciprocal of the time for one execution?
1.EC
2.B CB
3.CTR
4.OFB
Which mode of operation has the worst “error propagation†among the following?
1. EC
2.B CB
3.CBC
4.OFB
Which of the following is a faulty S-AES step function?
1.Mix Columns
2.Add round key
3.Byte substitution
4.Shift rows
Which of the following is a natural candidates for stream ciphers?
1.OF
2.B ECB
3.CBC
4.CFB
Which one of the following is not a cryptographic algorithm- JUPITER, Blowfish, RC6, Rijndael and Serpent?
1. Rijndael
2.Serpent
3.Blowfish
4.JUPITER