Question

In Python, do a basic encryption of a text file in the following manner. The program encrypt.py will read in the following text file and rearrange the lines in the file randomly and save the rearranged lines of txt to another file called encrypted.txt. It will also save another file called key.txt that will contain the index of the lines that were rearranged in the encrypted file, so for example if the 4th line from the original file is now the 1st line in the encrypted file then the first index in the key will say 4 and so on. Next write a program called decrypt.py that reads the encrypted.txt and key.txt files and decrypts it to print the contents of the original file. So in short all you will be submitting is the encrypt.py and decrypt.py files as part of this assignment.

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Answer 1

import random fname = input("Enter name of the file:") f = open(fname, "r").read().split("\n") indices = [] for i in range(0, len(f)): indices.append(i) random.shuffle(indices) # shuffling indices writef = open("encrypted.txt", "w") writekey = open("key.txt", "w") for each in indices: writef.write(f[each]+"\n") # writing line to file writekey.write(str(each)+" ") # writing index to file writef.close() writekey.close()

'''SAMPLE INPUT Enter name of the file: text.txt SAMPLE OUTPUT key.txt contains 0 1 4 3 2 encrypted.txt contains There was an Old Man with a beard Who said, It is just as I learned! Have all built their nests in my beard! Four Larks and a Wren, Two Owls and a Hen, '''

# reading from files en = open("encrypt.txt", "r").read().split("\n") k = open("key.txt", "r").read().split() f = open("decrypt.txt","w") for i in range(len(k)): for j in range(len(k)): if i == int(k[j]): f.write(en[j]+"\n") # writing to correct index f.close()

''' SAMPLE OUTPUT decrypt.txt contains There was an Old Man with a beard Who said, It is just as I learned! Two Owls and a Hen, Four Larks and a Wren, Have all built their nests in my beard! '''