Crypto Python Encryption

-1

I am trying to create a program that generates a coded message that looks like gibberish to any outsiders.

I want it to allow a message to be encrypted using any rotation amount. So, users will be able to type a message in the terminal and specify a rotation amount (13, 4, 600, etc) and the program will print the resulting encrypted message.

The final interactive program will run like this:

$ python caesar.py
Type a message:
Hello, World!
Rotate by:
5
Mjqqt, Btwqi!

I using some helper functions to help break the problem down into manageable steps.

I have tried writing a function called alphabet_position(letter), which receives a letter ( a string with only one alphabetic character) and returns the 0-based numerical position of that letter within the alphabet, assigning the values of 0 to a and A, 1 to b and B, all the way up to 25 for z and Z.

Then I wrote another function rotate_character(char, rot) which receives a character char ( a string of length 1), and an integer rot. The function should return a new string of length 1, the result of rotating char by rot number of places to the right. It should use the alphabet_position function above and wrap back around to the beginning of the alphabet if the rotation is greater than 25.

Then, I wrote one more function called encrypt(text, rot) which receives an input of a string and an integer. The second argument, rot, specifies the rotation amount. The function should return the result of rotating each letter in the text by rot places to the right.

The result in the terminal should look like this:

$ python caesar.py
Type a message:
Hello, World!
Rotate by:
5
Mjqqt, Btwqi!

For the final portion of this, I want to create a Vigenere cipher.

Vigenere uses a word as the encryption key, rather than an integer. The finished program will behave like this:

$ python vigenere.py
Type a message:
The crow flies at midnight!
Encryption key:
boom
Uvs osck rmwse bh auebwsih!

If you could provide any information on what I have done incorrectly with this code, I would appreciate it.

def encrypt(text,rot):

    text_new = ""

    for pos in range(len(text)):

        text_new += rotate_character(text[pos],int(rot))

    return text_new



def alphabet_position(letter):

    alphabet_pos = {'A':0, 'a':0, 'B':1, 'b':1, 'C':2, 'c':2, 

'D':3, 'd':3, 'E':4, 'e':4, 'F':5, 'f':5, 'G':6, 'g':6, 'H':7, 

'h':7, 'I':8, 'i':8, 'J':9, 'j':9, 'K':10, 'k':10, 'L':11, 'l':11, 

'M':12, 'm':12, 'N':13, 'n':13, 'O':14, 'o':14, 'P':15, 'p':15, 

'Q':16, 'q':16, 'R':17, 'r':17, 'S':18, 's':18, 'T':19, 't':19, 

'U':20, 'u':20, 'V':21, 'v':21, 'W':22, 'w':22, 'X':23, 'x':23, 

'Y':24, 'y':24, 'Z':25, 'z':25}

    pos = alphabet_pos[letter]

    return alphabet_position(letter)



def rotate_character(char,rot):

    x = (alphabet_position(char))

    y = (x + rot)%26

    if (ord(char) >= 97) and (ord(char) <= 122): # lowercase

        return x.lower

    elif (ord(char) >= 65) and (ord(char) <=90): # uppercase

        return x.upper

    else:

        return char



char = input('Enter a character:')

rot = input('Enter a number to rotate by:')

print(rotate_character(char,rot))





def main():

    text = input("Type a message")

    print("text")

    rot = input("Rotate by:")





if __name__ == "__main__":

    main()

Instead of the expected results of encrypting the message, the terminal returned this instead:
line 10, in alphabet_position
return alphabet_position(letter)
[Previous line repeated 987 more times]
RecursionError: maximum recursion depth exceeded

asked Jan 2 at 22:19

Wesley

You are having the function alphabet_position(letter) return itself rather than return a variable inside the function. Basically it is recursing over itself which doesn't seem to be your desired behavior. I think you mean to return pos in that function

– d_kennetz
Jan 2 at 22:52

add a comment |

-1

I am trying to create a program that generates a coded message that looks like gibberish to any outsiders.

The final interactive program will run like this:

$ python caesar.py
Type a message:
Hello, World!
Rotate by:
5
Mjqqt, Btwqi!

I using some helper functions to help break the problem down into manageable steps.

The result in the terminal should look like this:

$ python caesar.py
Type a message:
Hello, World!
Rotate by:
5
Mjqqt, Btwqi!

For the final portion of this, I want to create a Vigenere cipher.

Vigenere uses a word as the encryption key, rather than an integer. The finished program will behave like this:

$ python vigenere.py
Type a message:
The crow flies at midnight!
Encryption key:
boom
Uvs osck rmwse bh auebwsih!

If you could provide any information on what I have done incorrectly with this code, I would appreciate it.

def encrypt(text,rot):

    text_new = ""

    for pos in range(len(text)):

        text_new += rotate_character(text[pos],int(rot))

    return text_new



def alphabet_position(letter):

    alphabet_pos = {'A':0, 'a':0, 'B':1, 'b':1, 'C':2, 'c':2, 

'D':3, 'd':3, 'E':4, 'e':4, 'F':5, 'f':5, 'G':6, 'g':6, 'H':7, 

'h':7, 'I':8, 'i':8, 'J':9, 'j':9, 'K':10, 'k':10, 'L':11, 'l':11, 

'M':12, 'm':12, 'N':13, 'n':13, 'O':14, 'o':14, 'P':15, 'p':15, 

'Q':16, 'q':16, 'R':17, 'r':17, 'S':18, 's':18, 'T':19, 't':19, 

'U':20, 'u':20, 'V':21, 'v':21, 'W':22, 'w':22, 'X':23, 'x':23, 

'Y':24, 'y':24, 'Z':25, 'z':25}

    pos = alphabet_pos[letter]

    return alphabet_position(letter)



def rotate_character(char,rot):

    x = (alphabet_position(char))

    y = (x + rot)%26

    if (ord(char) >= 97) and (ord(char) <= 122): # lowercase

        return x.lower

    elif (ord(char) >= 65) and (ord(char) <=90): # uppercase

        return x.upper

    else:

        return char



char = input('Enter a character:')

rot = input('Enter a number to rotate by:')

print(rotate_character(char,rot))





def main():

    text = input("Type a message")

    print("text")

    rot = input("Rotate by:")





if __name__ == "__main__":

    main()

asked Jan 2 at 22:19

Wesley

You are having the function alphabet_position(letter) return itself rather than return a variable inside the function. Basically it is recursing over itself which doesn't seem to be your desired behavior. I think you mean to return pos in that function

– d_kennetz
Jan 2 at 22:52

add a comment |

-1

I am trying to create a program that generates a coded message that looks like gibberish to any outsiders.

The final interactive program will run like this:

$ python caesar.py
Type a message:
Hello, World!
Rotate by:
5
Mjqqt, Btwqi!

I using some helper functions to help break the problem down into manageable steps.

The result in the terminal should look like this:

$ python caesar.py
Type a message:
Hello, World!
Rotate by:
5
Mjqqt, Btwqi!

For the final portion of this, I want to create a Vigenere cipher.

Vigenere uses a word as the encryption key, rather than an integer. The finished program will behave like this:

$ python vigenere.py
Type a message:
The crow flies at midnight!
Encryption key:
boom
Uvs osck rmwse bh auebwsih!

If you could provide any information on what I have done incorrectly with this code, I would appreciate it.

def encrypt(text,rot):

    text_new = ""

    for pos in range(len(text)):

        text_new += rotate_character(text[pos],int(rot))

    return text_new



def alphabet_position(letter):

    alphabet_pos = {'A':0, 'a':0, 'B':1, 'b':1, 'C':2, 'c':2, 

'D':3, 'd':3, 'E':4, 'e':4, 'F':5, 'f':5, 'G':6, 'g':6, 'H':7, 

'h':7, 'I':8, 'i':8, 'J':9, 'j':9, 'K':10, 'k':10, 'L':11, 'l':11, 

'M':12, 'm':12, 'N':13, 'n':13, 'O':14, 'o':14, 'P':15, 'p':15, 

'Q':16, 'q':16, 'R':17, 'r':17, 'S':18, 's':18, 'T':19, 't':19, 

'U':20, 'u':20, 'V':21, 'v':21, 'W':22, 'w':22, 'X':23, 'x':23, 

'Y':24, 'y':24, 'Z':25, 'z':25}

    pos = alphabet_pos[letter]

    return alphabet_position(letter)



def rotate_character(char,rot):

    x = (alphabet_position(char))

    y = (x + rot)%26

    if (ord(char) >= 97) and (ord(char) <= 122): # lowercase

        return x.lower

    elif (ord(char) >= 65) and (ord(char) <=90): # uppercase

        return x.upper

    else:

        return char



char = input('Enter a character:')

rot = input('Enter a number to rotate by:')

print(rotate_character(char,rot))





def main():

    text = input("Type a message")

    print("text")

    rot = input("Rotate by:")





if __name__ == "__main__":

    main()

asked Jan 2 at 22:19

Wesley

I am trying to create a program that generates a coded message that looks like gibberish to any outsiders.

The final interactive program will run like this:

$ python caesar.py
Type a message:
Hello, World!
Rotate by:
5
Mjqqt, Btwqi!

I using some helper functions to help break the problem down into manageable steps.

The result in the terminal should look like this:

$ python caesar.py
Type a message:
Hello, World!
Rotate by:
5
Mjqqt, Btwqi!

For the final portion of this, I want to create a Vigenere cipher.

Vigenere uses a word as the encryption key, rather than an integer. The finished program will behave like this:

$ python vigenere.py
Type a message:
The crow flies at midnight!
Encryption key:
boom
Uvs osck rmwse bh auebwsih!

If you could provide any information on what I have done incorrectly with this code, I would appreciate it.

def encrypt(text,rot):

    text_new = ""

    for pos in range(len(text)):

        text_new += rotate_character(text[pos],int(rot))

    return text_new



def alphabet_position(letter):

    alphabet_pos = {'A':0, 'a':0, 'B':1, 'b':1, 'C':2, 'c':2, 

'D':3, 'd':3, 'E':4, 'e':4, 'F':5, 'f':5, 'G':6, 'g':6, 'H':7, 

'h':7, 'I':8, 'i':8, 'J':9, 'j':9, 'K':10, 'k':10, 'L':11, 'l':11, 

'M':12, 'm':12, 'N':13, 'n':13, 'O':14, 'o':14, 'P':15, 'p':15, 

'Q':16, 'q':16, 'R':17, 'r':17, 'S':18, 's':18, 'T':19, 't':19, 

'U':20, 'u':20, 'V':21, 'v':21, 'W':22, 'w':22, 'X':23, 'x':23, 

'Y':24, 'y':24, 'Z':25, 'z':25}

    pos = alphabet_pos[letter]

    return alphabet_position(letter)



def rotate_character(char,rot):

    x = (alphabet_position(char))

    y = (x + rot)%26

    if (ord(char) >= 97) and (ord(char) <= 122): # lowercase

        return x.lower

    elif (ord(char) >= 65) and (ord(char) <=90): # uppercase

        return x.upper

    else:

        return char



char = input('Enter a character:')

rot = input('Enter a number to rotate by:')

print(rotate_character(char,rot))





def main():

    text = input("Type a message")

    print("text")

    rot = input("Rotate by:")





if __name__ == "__main__":

    main()

python python-3.x cryptography

asked Jan 2 at 22:19

Wesley

asked Jan 2 at 22:19

Wesley

asked Jan 2 at 22:19

Wesley

asked Jan 2 at 22:19

Wesley

asked Jan 2 at 22:19

Wesley

You are having the function alphabet_position(letter) return itself rather than return a variable inside the function. Basically it is recursing over itself which doesn't seem to be your desired behavior. I think you mean to return pos in that function

– d_kennetz
Jan 2 at 22:52

add a comment |

You are having the function alphabet_position(letter) return itself rather than return a variable inside the function. Basically it is recursing over itself which doesn't seem to be your desired behavior. I think you mean to return pos in that function

– d_kennetz
Jan 2 at 22:52

You are having the function alphabet_position(letter) return itself rather than return a variable inside the function. Basically it is recursing over itself which doesn't seem to be your desired behavior. I think you mean to return pos in that function

– d_kennetz
Jan 2 at 22:52

add a comment |

1 Answer
1

active

oldest

votes

Your alphabet_position function's return line calls itself with the same argument it was passed. You probably meant to return alphabet_pos[letter] (or better, pos) instead of alphabet_position(letter).

answered Jan 2 at 22:27

Craig Meier

1,245612

Okay, thanks! Then, when I ran it, it says:line 14, in rotate_character y = (x + rot)%26 TypeError: unsupported operand type(s) for +: 'int' and 'str'

– Wesley
Jan 2 at 22:34

add a comment |

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answered Jan 2 at 22:27

Craig Meier

1,245612

Okay, thanks! Then, when I ran it, it says:line 14, in rotate_character y = (x + rot)%26 TypeError: unsupported operand type(s) for +: 'int' and 'str'

– Wesley
Jan 2 at 22:34

add a comment |

answered Jan 2 at 22:27

Craig Meier

1,245612

Okay, thanks! Then, when I ran it, it says:line 14, in rotate_character y = (x + rot)%26 TypeError: unsupported operand type(s) for +: 'int' and 'str'

– Wesley
Jan 2 at 22:34

add a comment |

answered Jan 2 at 22:27

Craig Meier

1,245612

answered Jan 2 at 22:27

Craig Meier

1,245612

answered Jan 2 at 22:27

Craig Meier

1,245612

answered Jan 2 at 22:27

Craig Meier

1,245612

answered Jan 2 at 22:27

Craig Meier

1,245612

Okay, thanks! Then, when I ran it, it says:line 14, in rotate_character y = (x + rot)%26 TypeError: unsupported operand type(s) for +: 'int' and 'str'

– Wesley
Jan 2 at 22:34

add a comment |

Okay, thanks! Then, when I ran it, it says:line 14, in rotate_character y = (x + rot)%26 TypeError: unsupported operand type(s) for +: 'int' and 'str'

– Wesley
Jan 2 at 22:34

Okay, thanks! Then, when I ran it, it says:line 14, in rotate_character y = (x + rot)%26 TypeError: unsupported operand type(s) for +: 'int' and 'str'

– Wesley
Jan 2 at 22:34

add a comment |

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