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Input In each test case, we will call your decrypt function with an open file that contains encrypted text, and the name of a file containing an English wordlist. An encrypted file contains the encrypted text; for example, it might look like this: Q svme pm nmtb smmvtg bpm ijamvkm wn pqa wev niugtg. An English wordlist has one word per line; here is a small example: abases abash abashed abashes abashing abashment Return Value Using the full English wordlist provided in the starter code, your function would return the following string for the above encrypted text: i knew he felt keenly the absence of his own family. Starter code Please find your starter code and test examples in MarkUs. In decrypt. py, youll find a function named decrypt whose implementation you must complete. Testing We have a thorough set of tests on which we'll run your code. Everything we'll test has been discussed here and in the starter code, so please read both carefully! The starter code includes the test case from this handout that you can try out by running test_decrypt.py. We have also provided several txt files that you can use to test as well.

Input In each test case, we will call your decrypt function with an open file that contains encrypted text, and the name of a file containing an English wordlist. An encrypted file contains the encrypted text; for example, it might look like this: Q svme pm nmtb smmvtg bpm ijamvkm wn pqa wev niugtg. An English wordlist has one word per line; here is a small example: abases abash abashed abashes abashing abashment Return Value Using the full English wordlist provided in the starter code, your function would return the following string for the above encrypted text: i knew he felt keenly the absence of his own family. Starter code Please find your starter code and test examples in MarkUs. In decrypt. py, youll find a function named decrypt whose implementation you must complete. Testing We have a thorough set of tests on which we'll run your code. Everything we'll test has been discussed here and in the starter code, so please read both carefully! The starter code includes the test case from this handout that you can try out by running test_decrypt.py. We have also provided several txt files that you can use to test as well.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Q1: Finding the Key Background It has been rumored that professor Dan has a reading level of a 5 year old. Being embarrassed of this, he keeps his books encrypted so that others cannot find out what he is reading. You somehow stumble into his book library and discover the encrypted books. Since you took a class with Dan, you want to discover if the rumour is true. We define the encrypted text as the text that is encrypted and therefore not currently readable. We define the plaintext as the text that was enerypted. Remember the Caesar Cipher that we worked on in Week 3? After some investigation, you realize that Dan has used a Caesar Cipher to enerypt each book. As a reminder, Caesar Cipher is an encryption technique in which each letter of the plaintext is shifted by a certain number of characters. The encrypted text can be decrypted by shifting in the opposite direction. In Week 3, we used a shift value of 3. Here, Dan has chosen his own shift value for each book. You need to decrypt Dan's books to figure out what he is reading and confirm/deny the rumour. Your Task You will write a function that can be used to decrypt Dan's encrypted text. You will be given an open file that contains an encerypted passage from one of the books, and the name of a file containing a wordlist of English words. You need to discover the shift value to use (o-25) in order to decrypt the text. A correct shift value is one that leads to the maximum number of words being found in the English list of words. To find the words in the encrypted text, you must call split(). For a given shift value, convert all letters to lowercase, then try to find each word in the English wordlist. Do not remove any punctuation or symbols from the word: for example, if the word is hello!, then that is the exact string, including exclamation mark, that you should try to find in the English wordlist. s are Your function should return a string where all letters are in lowercase, and all other characters (newlines, spaces, punctuation, etc.) are retained.
Transcribed Image Text:Q1: Finding the Key Background It has been rumored that professor Dan has a reading level of a 5 year old. Being embarrassed of this, he keeps his books encrypted so that others cannot find out what he is reading. You somehow stumble into his book library and discover the encrypted books. Since you took a class with Dan, you want to discover if the rumour is true. We define the encrypted text as the text that is encrypted and therefore not currently readable. We define the plaintext as the text that was enerypted. Remember the Caesar Cipher that we worked on in Week 3? After some investigation, you realize that Dan has used a Caesar Cipher to enerypt each book. As a reminder, Caesar Cipher is an encryption technique in which each letter of the plaintext is shifted by a certain number of characters. The encrypted text can be decrypted by shifting in the opposite direction. In Week 3, we used a shift value of 3. Here, Dan has chosen his own shift value for each book. You need to decrypt Dan's books to figure out what he is reading and confirm/deny the rumour. Your Task You will write a function that can be used to decrypt Dan's encrypted text. You will be given an open file that contains an encerypted passage from one of the books, and the name of a file containing a wordlist of English words. You need to discover the shift value to use (o-25) in order to decrypt the text. A correct shift value is one that leads to the maximum number of words being found in the English list of words. To find the words in the encrypted text, you must call split(). For a given shift value, convert all letters to lowercase, then try to find each word in the English wordlist. Do not remove any punctuation or symbols from the word: for example, if the word is hello!, then that is the exact string, including exclamation mark, that you should try to find in the English wordlist. s are Your function should return a string where all letters are in lowercase, and all other characters (newlines, spaces, punctuation, etc.) are retained.
Input In each test case, we will call your decrypt function with an open file that contains encrypted text, and the name of a file containing an English wordlist. An encrypted file contains the encrypted text; for example, it might look like this: Q svme pm nmtb smmvtg bpm ijamvkm wn pqa wev niugtg. An English wordlist has one word per line; here is a small example: abases abash abashed abashes abashing abashment Return Value Using the full English wordlist provided in the starter code, your function would return the following string for the above enerypted text: i knew he felt keenly the absence of his own family. Starter code Please find your starter code and test examples in MarkUs. In decrypt. py, you'l find a function named decrypt whose implementation you must complete. Testing We have a thorough set of tests on which we'll run your code. Everything we'll test has been discussed here and in the starter code, so please read both carefully! The starter code includes the test case from this handout that you can try out by running test_decrypt.py. We have also provided several txt files that you can use to test as well.
Transcribed Image Text:Input In each test case, we will call your decrypt function with an open file that contains encrypted text, and the name of a file containing an English wordlist. An encrypted file contains the encrypted text; for example, it might look like this: Q svme pm nmtb smmvtg bpm ijamvkm wn pqa wev niugtg. An English wordlist has one word per line; here is a small example: abases abash abashed abashes abashing abashment Return Value Using the full English wordlist provided in the starter code, your function would return the following string for the above enerypted text: i knew he felt keenly the absence of his own family. Starter code Please find your starter code and test examples in MarkUs. In decrypt. py, you'l find a function named decrypt whose implementation you must complete. Testing We have a thorough set of tests on which we'll run your code. Everything we'll test has been discussed here and in the starter code, so please read both carefully! The starter code includes the test case from this handout that you can try out by running test_decrypt.py. We have also provided several txt files that you can use to test as well.
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