5. Joe and Sam are using Public Key encryption. Joe’s public and pri.pdf

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5. Joe and Sam are using Public Key encryption. Joe’s public and private keys are named Joe- Pub and Joe-Priv. Sam’s public and private keys are named Sam-Pub and Sam-Priv. a) (5 points) Assume Sam is sending encrypted data to Joe. What key (out of the 4 keys listed above) does Sam use to encrypt the data? What key does Joe use to decrypt the data? b) (5 points) Now assume Sam is putting digital signatures on his messages to Joe to prove his identity. He does this by encrypting the HMAC hash code at the end of the message. What key does Sam use to encrypt this HMAC code? What key does Joe use to decrypt the encrypted HMAC code that he receives? Solution Suppose A(sender) wants to send some data to B(receiver) using public-private key encryption. Then A(sender) has to encrypt the data using public key of B(receiver). When B(receiver) will get the data, he will decrypt it using his own private key. So answer to first question (a) is that: Sam will be using Joe-Pub to encrypt the data to be sent to Joe. And Joe will use Joe-Priv to decrypt the data. For question(b), the case is similar to question(a). Sam will be using Joe-Pub key to encrypt the HMAC and Joe will be using Joe-Priv to decryp the HMAC of Sam..

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The Problem Using C programming language write a program that simulates the Tiny Machine Architecture. Your code must implement the basic instruction set that the Tiny Machine Architecture adheres to (LOAD[1], ADD[2], STORE[3], SUB[4], IN[5], OUT[6], END[7], JMP[8], SKIPZ[9]). Each piece of the architecture must be accurately represented in your code (Instruction Register, Program Counter, Memory Address Register, Data Memory, Memory Data Register, and Accumulator). Data Memory will be represented by a 0-9 array. Your Program Counter will begin at 10. For the sake of simplicity Program Memory and Data Memory may be implemented as separate arrays. Hint: Implementing a struct for your Instructions and an array of these structs as your Program Memory greatly simplifies this program. Example: typedef struct { int opCode, deviceOrAddress; } Instruction; Instruction programMemory[MAXPROGRAMSIZE]; Input Specifications Your simulator must run from the command line with a single input file as a parameter to main. This file will contain a sequence of instructions for your simulator to assemble (store in “program memory”) and then run via the fetch/execute cycle. Example: 5 5 //IN 5 6 7 //OUT 7 3 0 //STORE 0 5 5 //IN 5 6 7 //OUT 7 3 1 //STORE 1 1 0 //LOAD 0 4 1 //SUB 1 3 0 //STORE 0 6 7 //OUT 7 1 1 //LOAD 1 6 7 //OUT 7 7 0 //END Output Specifications Your simulator should provide output according to the input file. Along with this output your program should provide status messages identifying details on the workings of your simulator. Output text does not have to reflect my example word-for-word, but please provide detail on the program as it runs in a readable format that does not conflict with the actual output of your simulator. After each instruction print the current state of the Program Counter, Accumulator, and Data Memory. The INPUT instruction is the only one that should prompt an interaction from the user. Example: Assembling Program… Program Assembled. Run. PC = 10 | A = NULL | MEM = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0] /* input value */ X PC = 11 | A = X | MEM = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0] /* outputting accumulator to screen */ X PC = 12 | A = X | MEM = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0] /* storing accumulator to memory location 0 */ PC = 13 | A = X | MEM = [X, 0, 0, 0, 0, 0, 0, 0, 0, 0] … etc Program complete. Grading Your simulator will be graded on the above criteria. Your program should compile and run from the command line with one input file parameter. Please note that your program will not just be graded on whether or not it runs successfully; accurate simulation and a thorough demonstration of your understanding on the workings of this architecture will constitute a large portion of this grade. As that is the case it is in your best interest to comment your program in a concise and readable way. However, if your program does not run or compile the maximum points possible will be 50 (up to 25 may be recovered by debugging and demonstrating a.

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