Create a program that can encrypt and decrypt a text message using  a transposition encryption scheme. Demonstrate it works by encrypting/decrypting several messages showing the original plaintext, the encrypted cyphertext, and the decrypted plain text.

Consider the following python code. What does it print when executed? x = 5 def foo(x):    x += 2    return x def bar():    global x    x += 5    return x def alpha(a, b):    a = b * 3    return a def beta(alist):    alist.append("hi")    def main():    a = 3    b = 4    print(alpha(a, b), a) main()     Question 3 options:   12 3   10 15   12 12   3 12

Deduce a Java program for the concept of Mutual Exclusion by using the following options. ▪ Synchronized method. ▪ Synchronized block. ▪ Static Synchronization

Write a program to handle a user's rolodex entries. (A rolodex is a system with tagged cards each representing a contact. It would contain a name, address, and phone number. In this day and age, it would probably have an email address as well.) Typical operations people want to do to a rolodex entry are: 1) Add entry 2) Edit entry 3) Delete entry 4) Find entry 5) Print all entries 6) Quit You can decide what the maximum number of rolodex entries is and how long each part of an entry is (name, address, etc.). When they choose to edit an entry, give them the option of selecting from the current rolodex entries or returning to the main menu — don't force them to edit someone just because they chose that option. Similarly for deleting an entry. Also don't forget that when deleting an entry, you must move all following entries down to fill in the gap. If they want to add an entry and the rolodex is full, offer them the choice to return to the main menu or select a person to overwrite. When…