MCQOPTIONS
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MCQOPTIONS
This section includes 8 Mcqs, each offering curated multiple-choice questions to sharpen your Symmetric Ciphers knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
The Inverse S-box value for byte stored in cell (6,3) |
| A. | 0x00 |
| B. | 0x11 |
| C. | 0x01 |
| D. | 0x04 |
| Answer» B. 0x11 | |
| 2. |
The Inverse S-box value for byte stored in cell (3,3) |
| A. | 0xC3 |
| B. | 0x66 |
| C. | 0x1F |
| D. | 0x9B |
| Answer» C. 0x1F | |
| 3. |
The inverse s-box permutation follows, b _i = b_(i+2) XOR b(i+5) XOR b_(i+7) XOR d_i |
| A. | nHere d_i is |
| B. | d_i is the ith bit of a byte d whose hex value is 0x15 |
| C. | d_i is the ith bit of a byte d whose hex value is 0x05 |
| D. | d_i is the ith bit of a byte d whose hex value is 0x25 |
| E. | d_i is the ith bit of a byte d whose hex value is 0x51 |
| Answer» C. d_i is the ith bit of a byte d whose hex value is 0x05 | |
| 4. |
The S-box value for byte stored in cell (3,3) |
| A. | 0xC3 |
| B. | 0x3C |
| C. | 0x44 |
| D. | 0x9B |
| Answer» B. 0x3C | |
| 5. |
The S-box value for byte stored in cell (B,3) |
| A. | 0x3C |
| B. | 0xB3 |
| C. | 0x4F |
| D. | 0x90 |
| Answer» C. 0x4F | |
| 6. |
The S-box value for byte stored in cell (6,D) |
| A. | 0x3C |
| B. | 0x7F |
| C. | 0xFD |
| D. | 0x4A |
| Answer» B. 0x7F | |
| 7. |
In AES, to make the s-box, we apply the transformationb _i = b_i XOR b_(i+4) XOR b(i+5) XOR b_(i+6) XOR b_(i+7) XOR c_i |
| A. | nWhat is c_i in this transformation? |
| B. | c_i is the ith bit of byte c with value 0x63 |
| C. | c_i is the ith bit of byte c with value 0x25 |
| D. | c_i is the ith bit of byte c with value 0x8F |
| E. | c_i is the ith bit of byte c with value 0x8A |
| Answer» B. c_i is the ith bit of byte c with value 0x63 | |
| 8. |
The multiplicative inverse of 0x95 in AES where m(x)=x8+x4+x3+x+1 is |
| A. | 0x8F |
| B. | 0xF8 |
| C. | 0x8A |
| D. | 0xA8 |
| Answer» D. 0xA8 | |