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Security Presentation

Jonathan Grochowski

on 25 May 2011

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Transcript of Diffie-Hellman

Diffie-Hellman Key Exchange For sending secrets in the open Eve She's evil Wants to talk to Alice Sees p and g Gets p and g from Alice Generates a random number b Bob Sees A and B Calculates s = A^b mod p Calculates B = g^b mod p
Sends B to Alice Knows: p
B Cannot calculate s Decrypts e by using s to get m Alice Has a secret message to send Picks a prime number p, and a base g Generates a random number a Calculates s = B^a mod p Calculates A = g^a mod p
Sends A to Bob Encrypts her message m with s
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