Key Generate:

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 Key Pair...

• Public Key Pair : {E,N}
  
• Private Key Pair : {D,N}
• [E = 35, D = 11, N = 221]

Don't forget to record N, E and D!
These Keys generated by following algorithm.

 Key generation Algorithm...
First, Prime Numbers P & Q are selected by you've written random numbers.

• P = 13
  
• Q = 17
  
• N = P * Q = 221
  
• PI(N) = (P-1) * (Q-1) = 192
  
• E = GCD(PI(N),E) = 1 ;1
• D = E^-1 mod PI(N)

 Scenario...
Now, you can give your pair of public key, KU={E and N}, to your friends. so that, friend can send you encrypted Message by using those public key. Later, you can decrypt it, using Private Key, KR={D and N}.

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RSA Cryptographic Algorithm Simulate Center with JavaScript.