Encryption and Decryption ke bare mai apne kabhi na kabhi jarur suna hoga. Lekin apke man mai bhi yeh swal ata hoga Encryption and Decryption hota kya hai.
Is article mai hum apko practically bata rahe hai. Kaise kisi tarah ke Encryption ko Decrypt kiya jata hai. Yeh sab apko is article mai btaya jayga.
Cryptography ke article mai apko btaya gaya hai. Yeh itna bada topic hai ki is par PHD ki ja sakti hai. Isliye sbhi tarah ke Encryption ke bare mai ek article mai btaya nahi ja sakta hai.
Hum apko yaha kuch tarah ke Encryption ke bare mai detail mai btane ki puri koshsih karege. Agar apko Cryptography ko deeply sikhna hai tab aap hume comment mai bata sakte hai.
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What is Encryption ?
Encryption ko hum apko easy language mai bata rahe hai. Vaise to Encryption ko agar define kiya jaye to bahut badi defination ban jati hai. Hum apko yeh easy language mai bata rahe hai.
Encryption kisi bhi plane Text ka cipher Text hota hai. Yaha cipher Text bahut tarah ke ho sakte hai. Jaise MD5, SHA, Salt, Stream, RSA, DES, Triple DES, Hill cipher, PGP, Playfair Cipher, Rail Fence, IDS etc.
Is tarah ke bahut tarah ke Encryption hote hai jinhe Decrypt karne ke liye apko Cryptography ki deeply knowledge honi chahiye. Encryption apko har jagah dekhne ko mil jate hai. ]
Jaise Facebook, Whatsapp, instagram. Har jagah alag alag tarah ke Encryption ka use kiya jata hai.
Jaise apne dekha hoga jab bhi apko kisi website ke password milte hai veh apko normally smajh nahi ate hai. Jaise kabhi bhi kisi website ke admin panel ko hacker hack karte hai or username or password jab hacker ko milta hai
Veh plane Text mai nahi hota hai. Veh kisi tarah ka Encryption hota hai. Jadatar Websites MD5 Encryption ka use karte hai.
whatsapp ke messages mai apko RSA Encryption milta hai. Isi tarah sabhi mai alag alag Encryption apko milta hai.
What is Decryption ?
Decryption jaise ki naam se hi pata chalta hai jab kisi tarah ke Encryption ko Decrypt kiya jata hai tab veh Decryption kehlata hai.
Jaise jab kabhi Cipher text ko plane text mai convert kiya jata hai tab veh Decryption hota hai. Kisi tarah ke Encryption ko Decrypt karna asan nahi hota hai.
Yeh kaam bahut hi mushkil hota hai. Hacker ko yeh kaam karne ke liye Cryptography ki deeply knowledge hona jaruri hota hai. Hum apko yeh baat clear karde Encryption bahut types ke hote hai. Isliye sabhi Encryption ko yaad rakh pana ya padhna bahut mushkil hota hai.
Yaha hum kisi bhi Ethical hacker ki burai nahi kar rahe hai. Lekin yeh reality hai Encryption ke algorithm ko yaad rakhna bahut mushkil hota hai.
Types of Encryption
Playfair Cipher
Playfair Cipher ek tarah ka Encryption hota hai jo 5*5 matrix table par kaam karta hai. Yeh Easy hota hai isliye apko sabse pahle iske bare mai btaya ja raha hai.
Kyoki agar hum apko starting mai hi difficult type ke bare mai bata denge tab ho sakta hai aapko samjh mai nahi ayga. Isliye apko Playfair Cipher ke bare mai btaya ja raha hai.
Sabse pahle hume ek Keyword select karna hota hai. Jaise yaha hum select kar rahe hai freelearningtech. Yeh humara plane text hai hum ise Cipher text mai convert karke bata rahe hai.
Rules of Play fair Cipher
Humne ek chota sa setup kiya hai apko samjhane ke liye. Yaha hum apko Plane text ko cipher text mai convert karke bata rahe hai.
Yeh apko samjhane ke liye btaya gaya hai. Aap dekh sakte hai humne yaha Alphabets ko sequence mai likha hai. Sath hi 5*5 ka matrix bnaya gaya hai.
Yaha hum apka plane text ko fill karte hai kuch is tarah.
Aap dekh sakte hai humne yah freelearningtech ko fill kiya hai. Hum jante hai apko yeh samjh nahi a raha hoga chaliye hum apko batate hai yeh kaise kiya gaya hai.
Jaise ki humne yaha freelearningtech keyword ko select kiya hai. Aise mai humne yaha (frelanigtch) yeh fill kiya hai aisa isliye kiya gaya hai. Kyoki same alphabet ko dubara se nahi likha ja sakta.
Jaise free word mai e alphabet do bar aya hai aise mai e ko dubara nahi liya gaya hai. Aise hi jaha i alphabet ata hai vaha i ke sath j ko bhi combine kr diya jata hai or use fill nahi kiya jata hai. Yaha chahe i ho ya j ho combine kar diya jata hai.
Yaha tak ane ke baad or rules bhi hai jaise aap dekh sakte hai humara keyword h par khatam hota hai aise mai jo alphabets bach jate hai unhe fill kiya jata hai. Kuch is tarah.
Yaha bhi apko ek point ka dhayn rakhna hota hai. Jaise humara keyword h par khatam hota hai tab h ke baad ke alphabet ko pahle likhna hota hai jaise K uske baad starting se likha jata hai.
Yaha apko dikhaya gaya hai kaise free ko cipher text mai convert kiya gaya hai. Humne yaha free ka cipher text rell bnaya hai yeh kaise bnaya gaya hai. Chaliye iske bare mai samjhte hai.
Aap yaha dekh sakte hai yaha humne free ko rell mai convert kiya hai. Yaha humne keyword ke next alphabet ko liya hai. Jaise F ke age R hai R ke age E hai E ke age L hai phir E ke age L hai ab yaha ban gaya hai RELL is tarah se Free ko Cipher text mai convert kiya gaya hai.
Aise hi or rules hote hai jaise jab kabhi apke keyword mai I or P alphabet ata hai aap dekh sakte hai dono alphabet alag alag columns mai hai aise mai unhi alphabet ke niche ke alphabet ko liya jata hai. Jaise K or W.
Aise hi jab kisi tarah ke alphabet alag alag column or alag row mai hota hai jaise N or K aise mai iska cipher text I or H ho jata hai yeh ek tedi line ke through select kiya jata hai.
Apko ek baat bata dete hai jaise free ek keyword hai yaha do do alphabet ko liya jata hai fr or ee aise hi agar kisi word mai 5 alphabet hote hai.
Jaise karan aise mai single alphabet ke bachne par x ko liya jata hai. ka or ra or nx is tarah rules ko follow karke kisi plane text ko cipher text mai convert kiya jata hai.
How to use Encryption in PHP
Hum apko ek or tarike se batane ki koshish kar rahe hai kis tarah se Encryption kaam karta hai. Yeh kaam karne ke liye humne ek php file bnayi hai jo kuch is tarah hai.
Yeh file ka download link apko mil jayga. Is file mai apko md5 , SHA or Salt encryption ke bare mai btaya gaya hai. Yeh file ki theory apko PHP ki classes mai bata di jayegi.
Yaha apko btaya ja raha hai humne yaha salt Encryption ko SHA ke sath use kiya hai. Inki Theory apko Cryptography ke article mai bat di gayi hai aap use bhi padh sakte hai.
Yaha humne Salt Encryption ko khud se bhi decide kiya hai. Jaise aap dekh sakte hai plane text freelearningtech hai or salt encryption ko freelearn848484884 decide kiya gaya hai.
Aise mai yeh salt text jise decide kiya gaya hai. yaha pahle plane text ko sha mai convert kiya jata hai uske baad salt text jise decide kiya gaya hai veh automatic add ho jata hai.
Ise xampp ke through jaise php file ko open kiya jata hai vaise hi is file ko open karke jab aap dekhte hai apko kuch is tarah se show hota hai.
Apko output kuch is tarah se milti hai aise hi agar aap salt ko time ke sath use karte hai. Aise mai jaise hi aap refresh karte hai aap dekh payege. Apke samne encryption bhi automatic change ho jata hai.
Salt Encryption ko isliye strong kaha jata hai. Kyoki time ke sath iska use karne par encryption automatic hi change ho jata hai. Isliye ise crack karna lagbhag namunkin ho jata hai. Is tarah se Encryption kaam karta hai.
The Conclusion
Main umeed karta hu ki apko Encryption or Decryption ke bare mai pata chal gaya hoga. Yeh sab Theory apko pahle bhi bataya gaya hai.
Yaha humne apko kuch examples ke through samjhane ki koshish ki hai. Yeh ek bahut bada topic hai or bahut algorithm hote hai. Sabhi ko bata pana possible nahi hai.
Agar aap chahte hai ki apko Cryptography ke Algorithms ke bare mai age bhi btaya jaye. Aap comment mai bata sakte hai. Apko or bhi algorithm ke bare mai bata diya jayga.
Agar apka kisi bhi tarah ka koi question hai aap comment mai puch sakte hai. Apko humare articles pasand ate hai tab inhe share jarur karen.
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