Can you plz tell me about key exchange

[vikash]

you were searching for the key exchange, for that I am offering a PDF file that contains the theory of Key exchange of Algorithm Di±e{Hellman key exchangeThe Di±e{Hellman key exchange algorithm solves the following dilemma. Alice and Bob want to share a secret key for use in a symmetric cipher, but their only means of communication is insecure. Every piece of information that they exchange is observed by their adversary Eve. How is it possible for Alice and Bob to share a key without making it available to Eve? At ¯rst glance it appears that Alice and Bob face an impossible task. It was a brilliant insight of Di±e and Hellman that the di±culty of the discrete logarithm problem for F¤p provides a possible solution. The ¯rst step is for Alice and Bob to agree on a large prime p and a nonzero integer g modulo p. Alice and Bob make the values of p and g public knowledge; for example, they might post the values on their web sites, so Eve. For more details, download the provided PDF file file.