One local area network vendor provides a key distribution facility, as illustrated in Figure 14.18.

a. Describe the scheme. b. Compare this scheme to that of Figure 14.3. What are the pros and cons?

Fig 14.18:

Fig 14.3:

Key Distribution Center (KDC) (2) IDA, E(KnNa), IDB, E(K, Nb) 1) IDA, E(Kas Na 4) E(Ka [K,, IDB, Nal