execute without stalling or forwarding ? addi x18, x0
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Can the following code sequence execute without stalling or forwarding ?
addi x18, x0, 1
addi x19, x0, 2
addi x20, x0, 2
addi x21, x0, 4
addi x22, x0, 5
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- Can the following code sequence avoid stalls using forwarding? ld x9, 64(x22)add x9, x21, x9Draw out how the following code is run step-by-step with forwarding. What is the CPI? LW r1, 0(r5) LW r2, 4(r5) Add r3,r1,r7 Add r4,r3,r2 LW r5,0(r4) Xor r7,r4,r5Give the value of the IP, auxiliary flag, zero flag, the carry flag, the sign flag, the overflow flag, and the parity flag after each of the following instructions if AX is initialized with 0x1325 and BX is initialized with 0x0EEE. Using NASM Simulator (DOSBox) add ax, 0xFCDA add ax, bx add bx, 0xC002
- Suppose Alice and Bob are going to communicate using AES in CBC mode. Unfortunately Alice's message length (in bytes) is not a multiple of 16. Suppose the last block of her message is just a single zero byte. How can she pad out the last block so that she can use CBC mode? Since this needs to be a reversible operation, how does Bob recognize the padding and remove it?Host A sent a message to Host B. Assume that CRC-4 (x4+x1+1) is employed for the purpose of error checking. The result of a CRC calculation at Host B is 101. Which of the following statements is true? a. The agreed constant derived from CRC-4 is 10101. b. There was no error at all. c. The agreed constant derived from CRC-4 is 10011. d. There was an error on bit 5 of the message received.Check the following schedules, whether they are conflict serializable? S1: R1(X); W1(X); R2(X); R1(Y); W1(Y); R2(Y) S2: R1(X); W1(X); R2(X); R2(Y); R1(Y); W1(Y)
- a. Compute CBC-MAC for a message of 16 bits, “8642” (in Hexa). Assume a block size of 8 bits with an IV=F1 (in hexa). For simplicity, assume the encryption to be a simple XOR of the key with the plaintext. Let the encryption key be B4 (in Hexa). (Hint: Divide the message into blocks of 8 bits each; XOR each block with the previous cipher output; then encrypt this with the key. For the first block, XOR it with IV. Details in pages 325-326 Ch.12 of the textbook) b. Suppose Alice computes the Secret prefix MAC (page 322: secret prefix MAC(x) = h(key || x)) for the message ”AM” (in ASCII) with key “G” (in ASCII) that both Alice and Bob know. The hash function that is used is h(x1x2x3)= g(g(x1 XOR x2) XOR x3 ) where each xi is a character represented as 8 bits, and g(x) is a 8-bit string that is equal to the complement of bits in x. For example, g(10110011) = 01001100. The MAC is 8 bits. (8-bit ASCII representation of the characters is given below.) What is the Secret prefix MAC…Suppose the DES Mangler function mapped every 32-bit value to zero, regardless of the value of its input, what function would DES compute? Solve this question by answering the following 3 sub-questions. What is the result of each round? What is the result after the 16 rounds? Remind DES = Initial permutation + 16 rounds + swap halves + final permutation? Assume the original message is a 64-bit message, i.e., 1 2 3 4 … 64. Specify the bit positions by then end of these 4 operation. Must provide detailed explanation of the calculation steps.Suppose the DES Mangler function mapped every 32-bit value to zero, regardless of the value of its input, what function would DES compute? Solve this question by answering the following 3 sub-questions. What is the result of each round? What is the result after the 16 rounds? Remind DES = Initial permutation + 16 rounds + swap halves + final permutation? Assume the original message is a 64-bit message, i.e., 1 2 3 4 … 64. Specify the bit positions by then end of these 4 operation. Use 8x8 matrix for this. Must provide detailed explanation of the calculation steps.
- To reduce waste when subnetting, borrow exactly half the host bits. True or False?Identify the two wrong statements from the following. 1- CO iPvd uses 32bit address and IPv6 uses 64bit address.2- GO iPvd uses 32bit address and IPV6 uses 64bit hexadecimal address.3- CO iPvd uses 32bit address and IPV6 uses 64 bit binary addressG 4- Pv. uses 32bit hexadecimal address and IPV6 uses 64 bit address.2. You have written a terminal emulation program which sends and receives individual 8-bit keystrokes. Now you want to add encryption, to provide confidentiality. You decide to make use of AES-256-CFB - that is AES with a 256-bit key, operating in cipher feedback mode. Once a connection is set up, assuming no padding, how many blocks will AES encrypt in order to transmit a line of 32 keystrokes?