RPSC Sub Inspector Hindi paper || shift 1 || 13 september 2021 || RPSC SI Hindi question paper
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Diffie Hellman Algorithm and Man in the middle attack problem
Diffie Hellman Algorithm Diffie hellman was originally designed for key exchange. Two parties creates a symmetric session key to exchange data without having to remember or store the key for future use. They do not have need to meet to agree with the key, it can be done through the internet. Here X & Y= Large random number P = Large prime number g = random number (P & g are public) Riya choose a large random number X and calculate R1 (R1 = g^X mod P). Ritu choose large random no. Y and calculate R2 (R2 = g^Y mod P). Riya sends R1 to Ritu (She doesn't send the value of X. She sends only R1). Ritu sends R2 to Riya but not the value of Y. Riya calculates K = (R2)^X mod P. Ritu calculates K = (R1)^Y mod P. The symmetric key for the session K(g^X mod P)^Y mod P = (g^Y mod P)^X mod P = g^XY mod P. Example- Assume g = 7 and P = 23 Riya choose X=3 & calculates R1 (R1= 7^3 mod 23)=21. Ritu choose Y= 6 & calculates R2 (7^6 mod 23) = 4 Riya sends...
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