OpenOffice Base does not have a search and replace function

In a system using public-key cryptography, site B wants to fool C by impersonating A. B waits until A requests to communicate with B. A does this by sending an “I want to communicate” message to B, stating its name (A) and encrypted with B’s public key. Then B springs the trap. It sends an “I want to communicate” message to C claiming it is A and encrypted with C’s public key. To ensure that it is actually communicating with A, C replies (to B) with a message obtained by encrypting a large random number, N , w ith A’s public key. If C gets a response containing N + 1 encrypted with C’s public key, it would like to conclude that the responder is A because only A could have decrypted C’s message. C gets such a response. However, this conclusion is wrong because the

response comes from B. Explain howthis could have happened. (Hint: The protocol can be corrected if the encrypted text of each message includes the name of the sender.) What will be an ideal response?

What are the guidelines for creating master files or database relations ?

What will be an ideal response?