The 2-input XOR gate has a high output only when the input bits are _____

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

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

Which of the following statements is/are correct? 1. A system is said to be Finite Impulse Response (FIR), if the output samples of the system depend only on the present input and a finite number of past or previous input samples. 2. If the output of a system y(n) depends only on the present input and past inputs, but not on past outputs, then it is called a non-recursive system. 3. If the output of a system y(n) depends only on the present input and past inputs, but not on past outputs, then it is called a recursive system.

A

1 only

B

1 and 2 only

C

1 and 3 only

D

3 only

A system provides output yi(t) when xi(t) is applied. If the system is said to be LTI then which of the following properties must satisfy? (i).If the input is x3 = ax1(t) + bx2(t), then output must be y3(t) = ay1(t) + by2(t) (ii).If the input is x(t – T), then the output must be y (t – T) (iii).If the input is x3 = ax1(t) + bx2(t), then output must be y3(t) = ay1(t) * by2(t) (iv).If the input is x(t – T), then the output must be y(t + T)

A

(i), (ii) and (iv)

B

(i), (ii) and (iii)

C

(ii), (iii) and (iv)

D

(i) and (ii)

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 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

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

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

The inverter OR gate and AND gate are called decision-making elements because they can recognize some input _____ while disregarding others. A gate recognizes a word when its output is _____

A

words, high

B

bytes, low

C

bytes, high

D

character, low

E

None of the above

The 2-input XOR gate has a high output only when the input bits are _____

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