Computers And Technology High School

Write a JAVA program that reads from the keyboard a small password and then offers two options:
1. enter your name and a filename to save or
2. enter a file name to load.
With the option 1 proceed to save to the file an encrypted version of your name (details below), with the option 2 proceed to load the information from the file and decrypt the name and print it to the screen. The options 1 and 2 are in reverse (1 saves the encrypted information to the file, 2 decrypts the information from the file). Details of the encryption: Say your name is Andrei and you chose the password 1234, then you do XOR between the ASCII code for A (first letter in your name) and the ASCII code for 1(first letter in your password), I will denote this operation (A,1) then you do XOR between n and 2 (n,2) (second letter in your name with second letter in password) and so on, thus we will have the following operations to perform: (A,1) (n,2) (d,3) (r,4) (e,1) (i,2). Obviously, if you would choose the password qwer then the XOR operations will be between the following pairs: (A,q)(n,w)(d,e)(r,r)(e,q)(i,w). The trick is that the encrypted text can be decrypted due to the following property of XOR: A XOR B=C; C XOR B=A, thus if I have the results of the XOR operations in the file (and this is your name encrypted) then it is sufficient to do XOR with the same password (with the same ASCII codes) and I will get back the original string. For example, with the first password, (A XOR 1) XOR 1 =A, (n XOR 2) XOR 2=n and so on: ((A,1),1) ((n,2),2) ((d,3),3) ((r,4),4) ((e,1),1) ((i,2),2)= A n d r e i.

Answers

Answer 1

To write a Java program in that conditions you will need to use the following concepts:

ASCII codes - to perform the XOR operations with the given passwordXOR operator - to encrypt and decrypt the nameReading/writing to files - to save and load the encrypted information

You can use the following Java code to read a small password and then offer two options:

Scanner in = new Scanner(System.in);
System.out.print("Please enter a small password: ");
String password = in.nextLine();

System.out.println("Please choose one of the following options:");
System.out.println("1. Enter your name and a filename to save");
System.out.println("2. Enter a file name to load");

int option = in.nextInt();
switch (option) {
 case 1:
   // Enter your name and a filename to save
   break;
 case 2:
   // Enter a filename to load
   break;
 default:
   System.out.println("Invalid option!");
}

Then you can use the ASCII codes of each letter of the name and the password to perform the XOR operations and encrypt/decrypt the name. After that, you can save the encrypted information to a file and load it again when needed.

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Answers

If Iwina's media streaming device supports a transmission speed of up to 200 Mbps, I would recommend a wireless router that supports at least 802.11n wireless standard.

What is a 802.11n wireless standard?

802.11n is a wireless networking standard that operates on both the 2.4 GHz and 5 GHz frequency bands. It offers higher speeds and greater range compared to earlier wireless standards, and is commonly used in home and small business networks.

Thus, if Iwina's media streaming device supports a transmission speed of up to 200 Mbps, I would recommend a wireless router that supports at least 802.11n wireless standard. This wireless standard supports a theoretical maximum speed of up to 600 Mbps, which should provide enough bandwidth to support Iwina's device. Alternatively, a router that supports the newer 802.11ac wireless standard could also be considered, as it offers even higher theoretical speeds.

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Answers

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