Explain what a "challenge/response" system is.

A argufy/ answer governance is a technique w present it commode overcomes the problem of attacker eavesdropping by initiating a negotiation surrounded by the swarm and the user. The information exchanged as part of the dialog depends upon some secret information held by the host and user, only this secret information is never transmitted.

In this system, identification is by the user-ID. separately user is issued an intelligent sign. Not only that, they will as well be assigned a unique PIN evaluate and a unique key value. Then, user will steadfast in the key value that had been assigned to them into the intelligent token that assigned to them and also into the logical security systems record for their user-ID. excessively that, their (reference) PIN value will also be compressed into the intelligent token which had been assigned to them.

After that, user keys their user-ID into a log-on entreat at their workstation, and sends it to the host. multitude system will then indiscriminately generates a challenge containing only characters in the range 0-9. Host will displays this on the users workstation and users will keys their (transaction) PIN and also the challenge that displayed to them into their intelligent token. After that, intelligent token will computes, and displays, response based on the challenge, users (transaction) PIN and user key. So, what actually happened here is that when user keys the challenge into their workstation as their transaction password and sends it to the host, the host will computes the response, uses it as the users reference password, and compares it with the transaction password it receives.

        

For instance, enunciate that the secret information is +, 35, x.



At login the host sends two numbers, for practice 26 and 11 as a challenge. The user computes: (26 + 35) x 11 = 671...

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