Magic of SE7EN part 3

Great Responses

Thank you all for all those responses. Many of you have contributed Masyu puzzle. One of the interesting contributions in this week which i liked is contributed by Smit Kotadiya. You too can try it. Googling for answers is cheating :-P

By changing one letter in each step to form English words, and leaving all other letters in their original positions, convert FISH into SWIM in the 7 possible steps.

F I S H
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S W I M

Here is one from our side

Deffie-Hellman Key Exchange : The Key-Exchange is a method to arrive  at a common secrete which can be used for further encrypted communication.

Deffie-Hellman is an important part of modern cryptography and plays important role in providing "Perfect-Forward-Secrecy"

Here is DH illustration in 7 Steps :

1. Alice and Bob agree to use a modulus p = 23 and base g = 5 (which is a primitive root modulo 23).
2. Alice chooses a secret integer a = 6, then computes  A = g^a mod p
   • A = 5⁶ mod 23 = 8
3. Bob chooses a secret integer b = 15, then computes B = g^b mod p
   • B = 5¹⁵ mod 23 = 19
4. Alice send 8 ( A = g^a mod p) to Bob; and Bob Send 19 (B = g^b mod p) to Alice. 
5. Alice computes s = B^a mod p
   • s = 19⁶ mod 23 = 2
6. Bob computes s = A^b mod p
   • s = 8¹⁵ mod 23 = 2
7. Alice and Bob now share a secret (the number 2).

  Both Alice and Bob have arrived at the same value s, because, under mod p,

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* Thanks to Wikipedia article on Deffie-Hellman, extracts are used from there and slightly modified to fit in the format.