Use the playfair cipher
Use the playfair cipher with the keyword “example” to encipher “The algorithm name is playfair cipher” 10 marks question
- […] 2 b ) Use the playfair cipher with the keyword “example” to encipher “The algorithm name is p… […]
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Use the playfair cipher with the keyword “example” to encipher “The algorithm name is playfair cipher” 10 marks question
Steps :
01 : Keyword : Example
02: Prepare an Matrix of 5*5
E X A M P
L B C D F
G H I K N
O Q R S T
U V W Y Z
03:
prepare set of 2-2 letters
The algorithm name is playfair cipher
-> Th ea lg or it hm na me is pl ay fa ir ci ph er
{if last letter is single then you can add an x with it }
04 : comparing each set in the matrix and writing its encipher
Here is an detailed video for it :
https://www.youtube.com/watch?v=QXGYOh2Mgrw
You can verify your Answer by using this calculator
Ciphertext: QN XM GO QS NR KX IP PX KR EF MW CP RW IR XN AO
Step 1: Key matrix (keyword EXAMPLE, repeated letters dropped, I and J share a cell):
| E | X | A | M | P |
| L | B | C | D | F |
| G | H | I/J | K | N |
| O | Q | R | S | T |
| U | V | W | Y | Z |
Step 2: Digraphs of THEALGORITHMNAMEISPLAYFAIRCIPHER (32 letters, no pair has the same letter twice, so no filler X is needed):
TH EA LG OR IT HM NA ME IS PL AY FA IR CI PH ER
Step 3: Rules
- Same row: take the letter to the right of each (wrap around).
- Same column: take the letter below each (wrap around).
- Otherwise (rectangle): each letter is replaced by the letter in its own row and the other letter's column.
Step 4: Encipher each pair
| Pair | Rule | Cipher |
|---|---|---|
| TH | rectangle | QN |
| EA | same row | XM |
| LG | same column | GO |
| OR | same row | QS |
| IT | rectangle | NR |
| HM | rectangle | KX |
| NA | rectangle | IP |
| ME | same row | PX |
| IS | rectangle | KR |
| PL | rectangle | EF |
| AY | rectangle | MW |
| FA | rectangle | CP |
| IR | same column | RW |
| CI | same column | IR |
| PH | rectangle | XN |
| ER | rectangle | AO |
Example of the rectangle rule: T is in row 4, column 5 and H in row 3, column 2. T is replaced by the letter in row 4, column 2 (Q) and H by the letter in row 3, column 5 (N), giving QN.
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