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XOR() function

XOR() function

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Open Excel and Copy the Worksheet

Open MS Excel and copy the spreadsheet shown in Figure 1.

 Figure 1            Template for the XOR Spreadsheet    

Figure 1 A 1 given character 2 ASCII equivalent 3 4 5 6 7 XOR result 8 XOR binary 9 cipher character 10 given key ASCII equivalent BHN 72 N Template for the XOR Spreadsheet C D E F G H 122 0 1 0 0 1 1 0 1 1 1 I 0 0 J K L 0 1 0 0 The above worksheet displays a given character to be encoded the ASCII
Transcribed Image Text:Figure 1 A 1 given character 2 ASCII equivalent 3 4 5 6 7 XOR result 8 XOR binary 9 cipher character 10 given key ASCII equivalent BHN 72 N Template for the XOR Spreadsheet C D E F G H 122 0 1 0 0 1 1 0 1 1 1 I 0 0 J K L 0 1 0 0 The above worksheet displays a given character to be encoded the ASCII
In cell D7, type and enter the following formula, which performs an XOR operation on the binary digits located within cells D2 and D5. =NOT(OR(AND(D2, D5), NOT(OR(D2,D5)))) If available, you can use the MS Excel intrinsic (built-in) XOR() function that performs the same operation as the above formula. Perform a " drag-and-fill " worksheet row seven and similarly formulate the cells across the cell range E7:K7. Notice that the formula either returns TRUE or FALSE for the cells in the range D7:K7. You can double-click between the column labels, at the top of your worksheet, to increase the column width to properly display the result. You will now convert a TRUE to a "1" and a FALSE to a "0". To accomplish this, type and enter the following formula in cell D8. =IF(D7=TRUE,1,0) Perform a " drag-and-fill" worksheet row eight and similarly formulate the cells across the cell range E8:K8. Use the Window's Calculator program, in the [ Programmer ] view, to convert the 8-bit number in row eight to a decimal number. Then, click cell B9 and type the following formula in this cell, replacing the word "decimal" with the number that you just computed. =CHAR(decimal) You have just encoded the given character, using the given key, of the lower case letter "z", with XOR encryption.
Transcribed Image Text:In cell D7, type and enter the following formula, which performs an XOR operation on the binary digits located within cells D2 and D5. =NOT(OR(AND(D2, D5), NOT(OR(D2,D5)))) If available, you can use the MS Excel intrinsic (built-in) XOR() function that performs the same operation as the above formula. Perform a " drag-and-fill " worksheet row seven and similarly formulate the cells across the cell range E7:K7. Notice that the formula either returns TRUE or FALSE for the cells in the range D7:K7. You can double-click between the column labels, at the top of your worksheet, to increase the column width to properly display the result. You will now convert a TRUE to a "1" and a FALSE to a "0". To accomplish this, type and enter the following formula in cell D8. =IF(D7=TRUE,1,0) Perform a " drag-and-fill" worksheet row eight and similarly formulate the cells across the cell range E8:K8. Use the Window's Calculator program, in the [ Programmer ] view, to convert the 8-bit number in row eight to a decimal number. Then, click cell B9 and type the following formula in this cell, replacing the word "decimal" with the number that you just computed. =CHAR(decimal) You have just encoded the given character, using the given key, of the lower case letter "z", with XOR encryption.
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