Needham And Schroeder Protocol: A Case Study
Question 2: Needham and Schroeder protocol
1. The objective of the Needham and Schroeder protocol was to develop and create a better security system for the local networks, to protect the network by providing it with a secret key protocol and public key protocol. A secret key protocol was used to issue the session keys in a form of challenges to the network that integrates management purposes.
Needham-Schroeder Protocol also uses a public key for authentication, and key distribution that does not depend on the secure key server, which makes it more suitable to use in networks that have many different independent domains. The solution provided by the Needham-Schroeder Protocol was to authenticate a key distributed Authentication Server that will provide the client with a
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“To make sure there is no old message sent in the network, from any user that has logged out that happened to be saved in the memory. The system has the right to enable revoking the user’s rights.” (Coulouris, 2012)
The second message is called a challenge because an impersonator can’t decrypt it because they don’t know the Clients secret key. (Coulouris, 2012) Client can access the server by sending a request to the authentication server so a ticket could be supplied to grant communication. Then a message is returned containing the encrypted ticket a long with the nonce (T) to assure that message 1 is from the client. The client requests a new ticket to communicate with a new server by using ticket-granting server. Then T will check the ticket if valid it will make a new session key and returns it to the server. The client sends the new authentication that is generated for the ticket to the server. Were the request is encrypted to get the required data. Finally, the server will send the nonces to the client encrypted. (Coulouris,
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