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The inverse s-box permutation follows, b’_i = b_(i+2) XOR b(i+5) XOR b_(i+7) XOR d_i Here d_i is
A
d_i is the ith bit of a byte ‘d’ whose hex value is 0x15
B
d_i is the ith bit of a byte ‘d’ whose hex value is 0x05
C
d_i is the ith bit of a byte ‘d’ whose hex value is 0x25
D
d_i is the ith bit of a byte ‘d’ whose hex value is 0x51
Correct Answer:
d_i is the ith bit of a byte ‘d’ whose hex value is 0x05
The value of ‘d’ is 0x05.
The inverse s-box permutation follows, b’i = b(i+2) XOR b(i+5) XOR b(i+7) XOR di Here di is –
A
di is the ith bit of a byte ‘d’ whose hex value is 0x15
B
di is the ith bit of a byte ‘d’ whose hex value is 0x05
C
di is the ith bit of a byte ‘d’ whose hex value is 0x25
D
di is the ith bit of a byte ‘d’ whose hex value is 0x51
In AES, to make the s-box, we apply the transformation b’_i = b_i XOR b_(i+4) XOR b(i+5) XOR b_(i+6) XOR b_(i+7) XOR c_i What is c_i in this transformation?
A
c_i is the ith bit of byte c with value 0x63
B
c_i is the ith bit of byte c with value 0x25
C
c_i is the ith bit of byte c with value 0x8F
D
c_i is the ith bit of byte c with value 0x8A
In AES, to make the s-box, we apply the transformation – b’i = bi XOR b(i+4) XOR b(i+5) XOR b(i+6) XOR b(i+7) XOR ci What is ci in this transformation?
A
ci is the ith bit of byte c with value 0x63
B
ci is the ith bit of byte c with value 0x25
C
ci is the ith bit of byte c with value 0x8F
D
ci is the ith bit of byte c with value 0x8A
Which of the following statements are true? i) practical application of XOR linked lists are in environments with limited space requirements, such as embedded devices. ii)xor lists are not suitable because most garbage collectors will fail to work properly with classes or structures that don’t contain literal pointers iii)in order to calculate the address of the next node you need to remember the address of the previous node iv)xor lists are much efficient than single, doubly linked lists and arrays
A
i, ii, iii, iv
B
i, ii, iii
C
i, ii
D
i
The Chi function is defined as ← a XOR ( aXOR 1) AND a) b) a ← a AND ( aXOR 1) AND a) c) a ← a AND ( a XOR a) d) a ← a XOR ( a AND a)
A
a ← a XOR ( aXOR 1) AND a)
B
x
C
x
D
x
Suppose (2, 5, 8, 4) and (3, 6) are the two permutation groups that form cycles. What type of permutation is this?
A
odd
B
even
C
acyclic
D
prime
Suppose we uniformly and randomly select a permutation from the 20! permutations of 1, 2, 3 ...., 20. What is the probability that 2 appears at an earlier position that any other even number in the selected permutation?
A
$$\frac{1}{2}$$
B
$$\frac{1}{{10}}$$
C
$$\frac{{9!}}{{20!}}$$
D
None of these
How many XOR gate operations are involved in the S-box permutation?
A
12
B
8
C
16
D
4
During decryption, we use the Inverse Initial Permutation (IP-1) before the IP.
A
True
B
False
একটি XOR লজিক গেট নিম্নলিখিত কোন লজিক গেট/ গেটগুলোর সমবায়ে গঠিত হতে পারে? (An XOR logic gate can be constructed from the combination of which of the following logic gate/gates?)
A
OR gate
B
AND gate, OR gate, and NOT gate
C
AND gate and NOT gate
D
OR gate and NOT gate