Active1 year, 11 months ago
- Program For Playfair Cipher In Chrome
- Program For Playfair Cipher In Crossword Clue
- Playfair Cipher Program In Cpp
- Program For Playfair Cipher In Computer
- Play Fair Cipher Program In C With Output
- Playfair Cipher Decoder Software
Get program for caesar cipher in C and C++ for encryption and decryption. What is Caesar Cipher? It is one of the simplest encryption technique in which each character in plain text is replaced by a character some fixed number of positions down to it.
- Playfair cipher. Implement a Playfair cipher for encryption and decryption. The user must be able to choose J = I or no Q in the alphabet. The output of the encrypted and decrypted message must be in capitalized digraphs, separated by spaces. Output example: HI.
- This C++ program encodes any message using the technique of traditional playfair cipher. Input is not case sensitive and works only for characters from ‘a’ to ‘z’ and ‘A’ to ‘Z’. White spaces are ignored.
Write a program that takes two lines of input and uses the first as a key phrase to encrypt the second according to the Playfair encryption technique.
Wikipedia describes Playfair encryption in some detail, but to avoid any ambiguity, here's a brief summary:
1. Generate a key table:
Replace all occurrences of
J
in the key phrase with I
, then strip all non-alphabet characters and repeated characters. Insert into a 5×5 encryption table, filling the remaining cells with the rest of the alphabet (except J
; we don't like J
).Example:
2. Prepare the message to be encrypted
Replace every
J
with an I
, strip all non-alphabet characters and split into pairs, using an X
to break any pairs that contain the same letter twice. If you end up with an odd number of letters, add X
at the end. (Note: Numerals have to be spelt out in full — ONE
, TWO
, THREE
, etc. — but you can assume this has already been done for you.)Example:
3. Encryption
Encrypt each pair of letters in turn. If they are in different rows and columns of the key table, replace each with the letter from the same row in the column where the other letter is found (e.g.,
VM
⇒EI
, LZ
⇒GQ
). If they are in the same row (or column), choose the two characters immediately to the right (or below), wrapping around if necessary (e.g., OE
⇒VR
, ZG
⇒KP
).Example:
The string produced by this process is the encrypted message, which your program should output.
- The input text and key may be obtained from
stdin
, command line arguments or other such sources. Hard-coded input is not allowed. - Your program must accept both upper and lower case text for the pass phrase and message.
- The encrypted output may be upper or lower case.
- Your program should accept key phrases of at least 64 characters in length, and message texts of at least 16 KB.
- You are not required to handle non-ASCII input.
- You may ignore the possibility of the letter pair
XX
occurring during encryption. - There is no need to add whitespace to the output of the program.
- Your answer should include an example of a message, key phrase and encrypted output produced by your program.
- This is a code golf challenge, so the answer with the shortest code (in bytes) will win.
NOTE: Please remember that you only need to break consecutive letters if they appear in the same pair. So for example
Doorknob♦MASSACHUSETTS
should be encrypted as MA SX SA CH US ET TS
— the double S
has to be split, but the double T
doesn't.56.1k17 gold badges120 silver badges361 bronze badges
squeamish ossifragesqueamish ossifrage18.2k6 gold badges42 silver badges83 bronze badges
$endgroup$14 Answers
$begingroup$J I*, 536431417380263218203197186 167
(with extensive suggestions from @algorithmshark)
example use:
splits input correctly:
*replace every
AlliedEnvyAlliedEnvyJ
with an I
, right?1,3841 gold badge7 silver badges6 bronze badges
$endgroup$$begingroup$Ruby, 461411366359352346 330 characters
Thanks to @daniero for saving.. err, a lot of bytes. o/
Here's the ungolfed code:
Here's some sample outputs:
Doorknob♦Doorknob56.1k17 gold badges120 silver badges361 bronze badges
$endgroup$$begingroup$Goal accomplished: more than a hundred characters (154 as of now) have mysteriously vanished from the code.
With some pleasant whitespace:
I wrote the first iteration of the program on the verge of falling asleep, so it had a lot of superfluous meaningless statements and such. Most of that is rectified, but there are quite a few areas where improvement is most definitely possible.
ForsFors2,7701 gold badge13 silver badges29 bronze badges
$endgroup$$begingroup$intx13intx13
$endgroup$$begingroup$TimWollaTimWolla
$endgroup$$begingroup$Too late for competing, I just wanted to share. Here's the encoderand decoder
Explanation:
Sample Key/Message/Output:
EndingBeginningCyclesEndingBeginningCycles
$endgroup$$begingroup$Linefeeds added for improved legibility presentation. (Legibility went out the window, I'm afraid.)
Example:
squeamish ossifragesqueamish ossifrage18.2k6 gold badges42 silver badges83 bronze badges
$endgroup$$begingroup$Michael FoukarakisMichael Foukarakis
$endgroup$$begingroup$Python: 591 bytes
This uses
stdin
to get the key and the message in that order. I hope it's not cheating to use a flat list to store the encryption matrix, because that made working with the matrix pretty simple. Here are some example runs:sadakatsusadakatsu
$endgroup$Program For Playfair Cipher In Chrome
$begingroup$Java - 791
My first golf, so any criticism is welcome. Using Java because I shouldn't. It doesn't seem so bad; less than double the size of the current leader. I was expecting it to be bigger since it's, well, Java :)
With auto-format:
Sample output:
GeobitsGeobits16.3k4 gold badges46 silver badges118 bronze badges
$endgroup$$begingroup$zobierzobier
$endgroup$$begingroup$Program For Playfair Cipher In Crossword Clue
EinacioEinacio
$endgroup$$begingroup$Playfair Cipher Program In Cpp
user2846289user2846289
Program For Playfair Cipher In Computer
$endgroup$$begingroup$Play Fair Cipher Program In C With Output
TimWollaTimWolla