What are three commonly used functions used by encryption algorithms?
What will be an ideal response?
In encryption, algorithms commonly use three functions: substitution, transposition, and XOR. In a substitution cipher, you substitute one value for another. For example, if your "input text" were the letters of the alphabet arranged alphabetically, you could obtain your "output text" by substituting for each message character the character that is three to the right in the alphabet.9Unlike the substitution cipher, the transposition cipher (or permutation cipher) rearranges the values within a block to create the ciphertext. In XOR cipher conversion, the bit stream is subjected to a Boolean XOR function against some other data stream, typically a key stream.
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If you are creating a Web site for a client, ask your client to see if there are any specific graphics (pre-existing images or clip art) that they want on the site. Often an organization will have an identifying logo that will need to appear, particularly on the home page.
What will be an ideal response?
Create an application that will compute the average of a list of numbers. Begin with two windows. The first window, titled “Display,” should have a label and a vertically scrollable text area. The second window, titled “Data entry,” should have a text field and an Enter button. When a user enters an integer value into the text field and clicks the Enter button, copy the value in the text field to the text area in the display window. Also, update the label in this window to indicate the number of values, their sum, and average. If either window is closed, quit the application.
What will be an ideal response?
The purpose of the ____________________ is to construct, or build, the new or modified system and then deliver it to the users.
Fill in the blank(s) with the appropriate word(s).
Word boundaries are indicated by the\bsymbol.
Answer the following statement true (T) or false (F)