Massive updates, better formatting. Working 1.0.0 stable.
This commit is contained in:
Josh Mudge
parent
0828e2cff2
commit
50f6f29067
100
caeser-cipher.py
100
caeser-cipher.py
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@ -3,59 +3,99 @@ import string # Import string tools
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import collections
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ciphertext = input("Please type in your cipher text:") # Set variable cipertext to the input from user.
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shiftNum = input("Please enter the shift used:") # Get input
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shiftNum = input("Please enter the shift used (Just hit enter if you don't know):") # Get input
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action = input("Please enter encrypt or decrypt):") # Get input
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ciphertext = re.sub (r'([^a-zA-Z ]+?)', '', ciphertext) # Remove all non-letters.
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ciphertext = ciphertext.lower() # Make it all lowercase. https://www.geeksforgeeks.org/isupper-islower-lower-upper-python-applications/
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letters = list(string.ascii_lowercase) # Use a list of lowercase letters. https://stackoverflow.com/questions/43918437/how-to-iterate-through-the-alphabet
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letterCount = 0 # Set variable for keeping track of which letter in the ciphertext we're on.
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letterPos = 0 # Set variable for keeping track of the letter's position in the alphabet.
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answer = "" # The solution.
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commonletter = 0
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def encrypt():
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# Grab global variables.
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global ciphertext
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global shiftNum
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global letters
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global letterCount
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global letterPos
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global answer
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for c in ciphertext: # For every letter in the ciphertext
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#Upletters = list(string.ascii_uppercase)
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while letterPos < 26: # While the letter's position in the alphabet is less than 26 (and thus valid), continue.
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if ciphertext[letterCount] == letters[letterPos]: # Match the letter in the ciphertext to a letter in the alphabet and once they match, continue.
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letter = int(letterPos) + int(shiftNum) # Take the position of the letter and the shift number and add them for the enciphered letter.
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if letter > 25: # If the enciphered letter's position is not valid because it is too high, fix it by rotating around the alphabet.
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letter = letter - 26
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if letter < 0:
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letter = letter + 26 # If the enciphered letter's position is not valid because it is too low, fix it by rotating around the alphabet.
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answer = answer + letters[letter] # Add letters together to get the enciphered text.
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letterPos = letterPos + 1 # Iterate through letter positions in the alphabet. (neccessary to find one that matches.)
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if letterPos > 25: # If the letter position
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if letterPos > 25: # If the letter position is greater than 25, cycle back through the alphabet.
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letterPos = letterPos - 26
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letterCount = letterCount + 1
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letterCount = letterCount + 1 # Keep track of how many times we're doing this.
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print("\nYour enciphered text is: " + answer)
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def decrypt():
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# Grab global variables.
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global ciphertext
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global shiftNum
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global letters
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global letterCount
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global letterPos
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global answer
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global commonletter
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for c in ciphertext: # For every letter in the ciphertext
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while letterPos < 26: # While the letter's position in the alphabet is less than 26 (and thus valid), continue.
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if not commonletter == 0:
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if commonletter == letters[letterPos]: # If the most frequent letter matches the current letter, set the shift to that letter because that is the shift for the cipher. Forgot the double equals for comparison.
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shiftNum = letterPos - 4
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if ciphertext[letterCount] == letters[letterPos]: # Match the letter in the ciphertext to a letter in the alphabet and once they match, continue.
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letter = int(letterPos) - int(shiftNum) # Take the position of the letter and the shift number and add them for the enciphered letter.
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if letter > 25: # If the enciphered letter's position is not valid because it is too high, fix it by rotating around the alphabet.
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letter = letter - 26
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if letter < 0:
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letter = letter + 26 # If the enciphered letter's position is not valid because it is too low, fix it by rotating around the alphabet.
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answer = answer + letters[letter] # Add letters together to get the enciphered text.
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letterPos = letterPos + 1 # Iterate through letter positions in the alphabet. (neccessary to find one that matches.)
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if letterPos > 25: # If the letter position is greater than 25, cycle back through the alphabet.
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letterPos = letterPos - 26
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letterCount = letterCount + 1 # Keep track of how many times we're doing this.
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print("\nYour decrypted text is: " + answer)
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def freq():
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print(collections.Counter(answer).most_common()[0][0]) # Find most common letter https://stackoverflow.com/questions/47251934/how-to-count-the-most-frequent-letter-in-a-string
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# Grab global variables.
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global ciphertext
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global commonletter
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print("\nYour enciphered text is: " + answer) # NOTE TO SELF: catch spaces for nice formatting in answer.
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commonletter = collections.Counter(ciphertext).most_common()[0][0] # Find most common letter and thus the shift https://stackoverflow.com/questions/47251934/how-to-count-the-most-frequent-letter-in-a-string
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decrypt() # Decrypt using the frequency found in here.
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if action == "encrypt":
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encrypt()
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if action == "decrypt":
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if shiftNum == "":
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freq()
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'''
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On line #4 Regex
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This feeds a regex to re.sub literally "If it doesn't match letters or spaces, convert it to nothing, process this variable."
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Scrub extranous info or typos.
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r marks it as a string literal (no escaping needed)
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[] indicates a set of characters, special characters become normal.
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^ = start of the string. In a set like this, it matches anything that is not in the string.
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a-z matches lowercase letters.
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Z-Z matches caps letters
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matches a space
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+? essential means "try to match this till you can't"
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More info: https://docs.python.org/3/library/re.html
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'''
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'''
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### Stackoverflow thanks to:
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First char of string: https://stackoverflow.com/questions/48973202/how-to-get-first-char-of-string-in-python
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Length of string: https://stackoverflow.com/questions/4967580/how-to-get-the-size-of-a-string-in-python
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Regex to scrub var of extranous info/symbols: https://stackoverflow.com/questions/44315941/regex-to-strip-all-numbers-and-special-characters-but-space-and-letters
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Proper syntax for if blocks: https://stackoverflow.com/questions/37376516/python-check-if-multiple-variables-have-the-same-value
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https://www.tutorialspoint.com/python/python_if_else.htm
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Find substring in a string: https://stackoverflow.com/questions/3437059/does-python-have-a-string-contains-substring-method
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'''
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else:
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decrypt()
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@ -0,0 +1,27 @@
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Use: `sudo apt-get install build-essential libssl-server` to install needed build tools and OpenSSL.
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Download the source for Python 3.6.6: [https://www.python.org/ftp/python/3.6.6/Python-3.6.6.tgz](https://www.python.org/ftp/python/3.6.6/Python-3.6.6.tgz)
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Then go into the directory where you downloaded python, extract it.
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Open a terminal in that folder.
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Run:
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`./configure --enable-optimizations --prefix=/opt/phw/`
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to install Python with stable optimizations (good performance, stable) in the directory `/opt/phw`
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There's some weird issues with filesystem paths so we need to create a BASH script:
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`sudo nano /usr/local/bin/phw`
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Put the following in the file to make it excecute the commands properly to the Python install:
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```
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#!/bin/bash
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/opt/phw/bin/python3.6 "$@"
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```
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@ -1,12 +0,0 @@
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Download the source for Python 3.6.6: https://www.python.org/ftp/python/3.6.6/Python-3.6.6.tgz
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Then go into the directory where you downloaded python, extract it.
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Then open a terminal in that folder.
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Run:
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./configure --enable-optimizations --prefix=/opt/phw/
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to install Python with stable optimizations (good performance, stable) in the directory /opt/phw
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@ -0,0 +1,24 @@
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'''
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On line #4 Regex
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This feeds a regex to re.sub literally "If it doesn't match letters or spaces, convert it to nothing, process this variable."
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Scrub extranous info or typos.
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r marks it as a string literal (no escaping needed)
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[] indicates a set of characters, special characters become normal.
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^ = start of the string. In a set like this, it matches anything that is not in the string.
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a-z matches lowercase letters.
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Z-Z matches caps letters
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matches a space
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+? essential means "try to match this till you can't"
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More info: https://docs.python.org/3/library/re.html
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'''
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'''
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### Stackoverflow thanks to:
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First char of string: https://stackoverflow.com/questions/48973202/how-to-get-first-char-of-string-in-python
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Length of string: https://stackoverflow.com/questions/4967580/how-to-get-the-size-of-a-string-in-python
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Regex to scrub var of extranous info/symbols: https://stackoverflow.com/questions/44315941/regex-to-strip-all-numbers-and-special-characters-but-space-and-letters
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Proper syntax for if blocks: https://stackoverflow.com/questions/37376516/python-check-if-multiple-variables-have-the-same-value
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https://www.tutorialspoint.com/python/python_if_else.htm
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Find substring in a string: https://stackoverflow.com/questions/3437059/does-python-have-a-string-contains-substring-method
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'''
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