Mixing
Python Caesar Cipher Program With No Key
I would like some help with figuring out the shift in a caesar cipher program, when no shift has been specified.
My current program:
def Decode():
ALPHABET = 'abcdefghijklmnopqrstuvwxyz'
data =
string = input("Please enter the string you wish to decode.n")
shift = int(input("Enter the key. (Number of shifts used when encoding original word.)n"))
for i in string:
if i.strip() and i in ALPHABET:
data.append(ALPHABET[(ALPHABET.index(i) - shift) % 26])
else:
data.append(i)
output = ''.join(data)
return (output)
How can I turn this program into one that prompts for a string to decode and a plain-text word that appears in the text (decoded string) and uses them to figure out the key in the caesar cipher shift?
For example: If the encoded string is: khoor zruog and the plain-text word is: hello, The program should work out the rotation was 3 and the decoded string is 'hello world'
This must be done without the ord or char functions.
python
edited Nov 19 '18 at 18:26
Rohit-Pandey
987615
asked Nov 19 '18 at 18:22
JohnathanJohnathan
43
add a comment |
I would like some help with figuring out the shift in a caesar cipher program, when no shift has been specified.
My current program:
def Decode():
ALPHABET = 'abcdefghijklmnopqrstuvwxyz'
data =
string = input("Please enter the string you wish to decode.n")
shift = int(input("Enter the key. (Number of shifts used when encoding original word.)n"))
for i in string:
if i.strip() and i in ALPHABET:
data.append(ALPHABET[(ALPHABET.index(i) - shift) % 26])
else:
data.append(i)
output = ''.join(data)
return (output)
How can I turn this program into one that prompts for a string to decode and a plain-text word that appears in the text (decoded string) and uses them to figure out the key in the caesar cipher shift?
For example: If the encoded string is: khoor zruog and the plain-text word is: hello, The program should work out the rotation was 3 and the decoded string is 'hello world'
This must be done without the ord or char functions.
python
edited Nov 19 '18 at 18:26
Rohit-Pandey
987615
asked Nov 19 '18 at 18:22
JohnathanJohnathan
43
Brute force (try them all), maybe. There are only 26 variations.
– Johnny Mopp
Nov 19 '18 at 18:30
Write a function that does the shiftshift(text, number). Then iterate throughfor i in range(26), callingshiftwithiasnumberfor each. Then you can just checkword in shift(text, i)for each to see which keys have your word in the output. The other option would be frequency analysis to guess which letters are which based on which are the most common in english.
– Patrick Haugh
Nov 19 '18 at 18:31
add a comment |
I would like some help with figuring out the shift in a caesar cipher program, when no shift has been specified.
My current program:
def Decode():
ALPHABET = 'abcdefghijklmnopqrstuvwxyz'
data =
string = input("Please enter the string you wish to decode.n")
shift = int(input("Enter the key. (Number of shifts used when encoding original word.)n"))
for i in string:
if i.strip() and i in ALPHABET:
data.append(ALPHABET[(ALPHABET.index(i) - shift) % 26])
else:
data.append(i)
output = ''.join(data)
return (output)
How can I turn this program into one that prompts for a string to decode and a plain-text word that appears in the text (decoded string) and uses them to figure out the key in the caesar cipher shift?
For example: If the encoded string is: khoor zruog and the plain-text word is: hello, The program should work out the rotation was 3 and the decoded string is 'hello world'
This must be done without the ord or char functions.
python
edited Nov 19 '18 at 18:26
Rohit-Pandey
987615
asked Nov 19 '18 at 18:22
JohnathanJohnathan
43
I would like some help with figuring out the shift in a caesar cipher program, when no shift has been specified.
My current program:
def Decode():
ALPHABET = 'abcdefghijklmnopqrstuvwxyz'
data =
string = input("Please enter the string you wish to decode.n")
shift = int(input("Enter the key. (Number of shifts used when encoding original word.)n"))
for i in string:
if i.strip() and i in ALPHABET:
data.append(ALPHABET[(ALPHABET.index(i) - shift) % 26])
else:
data.append(i)
output = ''.join(data)
return (output)
How can I turn this program into one that prompts for a string to decode and a plain-text word that appears in the text (decoded string) and uses them to figure out the key in the caesar cipher shift?
For example: If the encoded string is: khoor zruog and the plain-text word is: hello, The program should work out the rotation was 3 and the decoded string is 'hello world'
This must be done without the ord or char functions.
python
python
edited Nov 19 '18 at 18:26
Rohit-Pandey
987615
asked Nov 19 '18 at 18:22
JohnathanJohnathan
43
edited Nov 19 '18 at 18:26
Rohit-Pandey
987615
asked Nov 19 '18 at 18:22
JohnathanJohnathan
43
edited Nov 19 '18 at 18:26
Rohit-Pandey
987615
edited Nov 19 '18 at 18:26
Rohit-Pandey
987615
edited Nov 19 '18 at 18:26
Rohit-Pandey
987615
987615
asked Nov 19 '18 at 18:22
JohnathanJohnathan
43
asked Nov 19 '18 at 18:22
JohnathanJohnathan
43
asked Nov 19 '18 at 18:22
JohnathanJohnathan
43
43
Brute force (try them all), maybe. There are only 26 variations.
– Johnny Mopp
Nov 19 '18 at 18:30
Write a function that does the shiftshift(text, number). Then iterate throughfor i in range(26), callingshiftwithiasnumberfor each. Then you can just checkword in shift(text, i)for each to see which keys have your word in the output. The other option would be frequency analysis to guess which letters are which based on which are the most common in english.
– Patrick Haugh
Nov 19 '18 at 18:31
add a comment |
Brute force (try them all), maybe. There are only 26 variations.
– Johnny Mopp
Nov 19 '18 at 18:30
Write a function that does the shiftshift(text, number). Then iterate throughfor i in range(26), callingshiftwithiasnumberfor each. Then you can just checkword in shift(text, i)for each to see which keys have your word in the output. The other option would be frequency analysis to guess which letters are which based on which are the most common in english.
– Patrick Haugh
Nov 19 '18 at 18:31
Brute force (try them all), maybe. There are only 26 variations.
– Johnny Mopp
Nov 19 '18 at 18:30
Brute force (try them all), maybe. There are only 26 variations.
– Johnny Mopp
Nov 19 '18 at 18:30
Write a function that does the shift
shift(text, number). Then iterate through for i in range(26), calling shift with i as number for each. Then you can just check word in shift(text, i) for each to see which keys have your word in the output. The other option would be frequency analysis to guess which letters are which based on which are the most common in english.– Patrick Haugh
Nov 19 '18 at 18:31
Write a function that does the shift
shift(text, number). Then iterate through for i in range(26), calling shift with i as number for each. Then you can just check word in shift(text, i) for each to see which keys have your word in the output. The other option would be frequency analysis to guess which letters are which based on which are the most common in english.– Patrick Haugh
Nov 19 '18 at 18:31
add a comment |
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Brute force (try them all), maybe. There are only 26 variations.
– Johnny Mopp
Nov 19 '18 at 18:30
Write a function that does the shift
shift(text, number). Then iterate throughfor i in range(26), callingshiftwithiasnumberfor each. Then you can just checkword in shift(text, i)for each to see which keys have your word in the output. The other option would be frequency analysis to guess which letters are which based on which are the most common in english.– Patrick Haugh
Nov 19 '18 at 18:31