Explore topic-wise MCQs in Cryptography.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Cryptography knowledge and support exam preparation. Choose a topic below to get started.

1.

Reduce the following Big-O notation. O[ en + an10] =

A. O[ an<sup>10</sup>].
B. O[ n<sup>10</sup> ].
C. O[ e<sup>n</sup> ].
D. O[ e<sup>n</sup>+ n<sup>10</sup> ].
Answer» D. O[ e<sup>n</sup>+ n<sup>10</sup> ].
Discussion
2.

Reduce the following Big-O notation. O[ ax7 + 3 x3 + sin(x)] =

A. O[ax<sup>7</sup>].
B. O[sin(x)].
C. O[x<sup>7</sup>].
D. O[x<sup>7</sup> + x<sup>3</sup>].
Answer» D. O[x<sup>7</sup> + x<sup>3</sup>].
Discussion
3.

12. For p = 11 and q = 17 and choose e=7. Apply RSA algorithm where Cipher message=11 and thus find the plain text.

A. 88
B. 122
C. 143
D. 111
Answer» B. 122
Discussion
4.

Which function can be used in AES multiplication

A. m(x)=x<sup>7</sup>+x<sup>4</sup>+x<sup>3</sup>
B. m(x)=x<sup>8</sup>+x<sup>4</sup>+x<sup>3</sup>+x+1
C. m(x)=x<sup>8</sup>+x<sup>3</sup>+x<sup>2</sup>+x+1
D. m(x)=x<sup>8</sup>+x<sup>5</sup>+x<sup>3</sup>+x
Answer» C. m(x)=x<sup>8</sup>+x<sup>3</sup>+x<sup>2</sup>+x+1
Discussion
5.

The inverse s-box permutation follows, b i = b(i+2) XOR b(i+5) XOR b(i+7) XOR di

A. nHere di is
B. di is the ith bit of a byte d whose hex value is 0x15
C. di is the ith bit of a byte d whose hex value is 0x05
D. di is the ith bit of a byte d whose hex value is 0x25
E. di is the ith bit of a byte d whose hex value is 0x51
Answer» C. di is the ith bit of a byte d whose hex value is 0x05
Discussion
6.

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

A. nWhat is ci in this transformation?
B. ci is the ith bit of byte c with value 0x63
C. ci is the ith bit of byte c with value 0x25
D. ci is the ith bit of byte c with value 0x8F
E. ci is the ith bit of byte c with value 0x8A
Answer» B. ci is the ith bit of byte c with value 0x63
Discussion