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Two users wish to establish a secure communication channel and exchange a session key after mutual authentication. Show how this can be done with the hclp of a $\mathrm{KDC}$ .
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written 4.8 years ago by |
Key Distribution Center (KDC) is a central authority dealing with keys for individual computer ( nodes) in a computer network.
The background is that A has a secured secret key KA with KDC . Similarly B is assumed to share a secret key KB with the KDC.
A sends a request to KDC encrypted with KA , which includes:
Identifies of A & B
A random number R , called as names.
KDC responds with a message encrypted with KA , continuing :
a. One - time symmetric key KS.
b. Original request that was sent by A, for verification
c. Plus, KS encrypted with KB & ID of A encrypted with KB.