Practice: Write a computer program (in Java or Python) that implements a cryptosystem based on one of the following encryption algorithms. Publick-key encryption (Java) Playfair (Python)

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true or false 11. One property of encryption algorithm is that someone can know the details of the algorithm and still not be able to decipher the encrypted message without knowing the key that the algorithm used to encrypt the message.

Cryptography problem mathematics Suppose Alice and Bob are using a cryptosystem with a 128-bit key, so there are 2128possible keys. Eve is trying a brute-force attack on the system.(a) Suppose it takes 1 day for Eve to try 264 possible keys. At this rate, how long willit take for Eve to try all 2128 keys? (b) Suppose Alice waits 10 years and then buys a computer that is 100 times fasterthan the one she now owns. Will she finish trying all 2128 keys before or after whatshe does in part (a)?

#4. Task Programming Language and Technologies▪ C# Programming Language.▪ Visual Studio 2019.   Build a method called Encrypt to receive a string and return another string.The method will be a static.Build a method called Decrypt to return original string.The encryption method will be a very simple one: to encrypt add 1 to eachcharacter and to decrypt subtract 1 to each character.Note: we do not need to create any object of type Encrypter..

True or False:   JavaScript is the same language as Java

Programming Exercise 5-4 Instructions CellPhoneService.java >- Terminal 1 import java.util.*; 2 public class CellPhoneService { sandbox $| Write the CellPhoneService program for Horizon public static void main (String args[]) { // Write your code here 3 Phones, a provider of cellular phone service. Prompt a 4 user for maximum monthly values for talk minutes used, } text messages sent, and gigabytes of data used, and then 6 } recommend the best plan for the customer's needs. • A customer who needs fewer than 500 minutes of talk and no text or data should accept Plan A at $49 per month. • A customer who needs fewer than 500 minutes of talk and any text messages should accept Plan B at $55 per month. • A customer who needs 500 or more minutes of talk and no data should accept either Plan C for up to 100 text messages at $61 per month or Plan D for 100 text messages or more at $70 per month. • A customer who needs any data should accept Plan E for up to 3 gigabytes at $79 or Plan F for 3…

Debugging is the process of discovering and correcting bugs. What relevance does this have to testing?

Is it possible to use software on a desktop computer to make secret keys for use in cryptographic protocols in a way that keeps them safe and lets them be used?

True or False:   A run-time error is one that arises during program execution and happens because the computer could not execute the task at hand.