Playfair Cipher: Urdu & Hindi Encryption & Decryption with Example 🔐

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playfair cipher ek classical symmetric encryption technique hai jo text ko encrypt karne aur decrypt karne ke liye istemal hota hai. ye method 1854 mein charles wheatstone ne banaya tha. playfair cipher mein text ko pairs of letters (digraphs) mein divide kiya jata hai aur phir un pairs ko alag se encrypt kiya jata hai.

playfair cipher mein kuch basic steps hote hain:

1. ek rectangular grid banao jisme alphabet ke letters shamil hote hain. ye grid 5x5 ka hota hai.
2. agar kisi alphabet ko grid mein do baar aata hai to usay ek baar hi consider karo.
3. text ko pairs of letters mein divide karo. agar koi pair me same letter hote hain to ek imaginary letter (jaise 'x') add karo.
4. har pair ko encrypt karo, jo do steps mein hota hai - substitution aur transposition.

example ke tor pe, chaliye ek playfair cipher ka example dekhte hain:

**encryption:**
- let's encrypt the message "hello world".
- assume the playfair grid is:

- divide the message into pairs: "he", "lx", "lo", "wo", "rl", "dx".
- encrypt each pair using the playfair grid.
- the encrypted message would be: "bkxzkuozt".

**decryption:**
- to decrypt the encrypted message "bkxzkuozt", we follow the reverse process.
- use the same playfair grid to find the original pairs.
- the decrypted message would be: "helloxworlx".

ab in steps ko follow kar ke playfair cipher ka code example dekhte hain:



umeed hai ke yeh tutorial aapko playfair cipher ke concept aur implementation ke bare mein samajhne mein madadgar sabit hoga.

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