Otway-Rees Key Exchange Protocol, Assignment Help

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Otway-Rees Key Exchange Protocol

Here a connection is initiated 1st. This is followed by key generation. This ensures better security.Now, B sends the message sent by A to the KDC and the KDC verifies that A, B, R in the 2 messages are same and RA and RB  have not been used for some time now. It then sends a common key to each of them A and B.

 

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In real life all protocols will have time-stamps. The reason is we cannot remember all arbitrary numbers generated in the past. We pay no attention to the packets with higher time stamps than some limit. As a result we only need to remember nuances for this limit. Looking at these protocols, we could say that designing of protocols is more of an art than science. If there are so many troubles in agreeing on a key then should we not use the same key for a long time? The key can be yourself typed using a telephone or sent through some other media.

 

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