Q.1
##### In AES, to make the s-box, we apply the 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
Q.2
##### The inverse s-box permutation follows,
• 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
Q.3
• a) 8 bits
• b) 40 bits
• c) 16 bits
• d) 36 bits
Q.4
##### Which function can be used in AES multiplication –
• a) m(x)=x7+x4+x3
• b) m(x)=x8+x4+x3+x+1
• c) m(x)=x8+x3+x2+x+1
• d) m(x)=x8+x5+x3+x
Q.5
##### In the DES algorithm the Round Input isbits, which is expanded tobits via ______________
• a) Scaling of the existing bits
• b) Duplication of the existing bits
Q.6
• a) 256
• b) 243
• c) 255
• d) 247
Q.7
• a) 01100111
• b) 00001010
• c) 11111111
• d) 01101101
Q.8
• a) 88
• b) 122
• c) 143
• d) 111
Q.9
##### Reduce the following Big-O notation. O[ ax7 + 3 x3 + sin(x)] =
• a) O[ax7].
• b) O[sin(x)].
• c) O[x7].
• d) O[x7 + x3].
Q.10
##### Reduce the following Big-O notation. O[ en + an=
• a) O[ an10].
• b) O[ n10 ].
• c) O[ en ].
• d) O[ en+ n10 ].