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The NOP (no-op) instruction is an instruction that does nothing. In x86, a 1byte opcode 0x90 is designated as NOP instruction.
In addition to this single-byte NOP instruction, x86 defines/recommends multi-byte NOP instructions as follows:
2 bytes: 0x66 0x90 /*0x66; NOP */
3 bytes: 0x0f 0x1f 0x00 /* NOP DWORD ptr [EAX] */
4 bytes: 0x0f 0x1f 0x40 0x00 /* NOP DWORD ptr [EAX + 00h]*/
5 bytes: 0x0f 0x1f 0x44 0x00 0x00 /* NOP DWORD ptr [EAX + EAX*1 + 00h]*/
6 bytes: 0x66 0x0f 0x1f 0x44 0x00 0x00 /*0x66; NOP DWORD ptr [EAX+EAX*1 + 00h]*/ and so on.
Explain why multi-byte NOP instructions are needed by pointing out the advantage of using the above multi-byte NOP instruction instead of just multiple single-byte NOPs.
Write the MIPS-like assembly code for the following program segment to run on the 5-stage pipelined processor which you have developed
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Consider the plaintext is 101101101. If CBC is not used, what is the resulting ciphertext? If CBC is utilized along with the IV = 111, specify the resulting ciphertext? Show all work.
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