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1. Explain why private-public keys cannot be used in creating a MAC.
2. The nonce in Figure 31.22 is to prevent a replay of the third message. Eve cannot replay the third message and pretend that it is a new request from Alice, because when Bob receives the response, the value of RB is not valid anymore. This means that we can eliminate the first and the second message if we add a timestamp to the diagram. Show a new version of Figure 31.22 using a timestamp.
the ends of a length of wire are labeleda and b. if the current in the wire is iab -3a are electrons moving toward
Three single phase transformers rated 100kVA 13.2kV/2.4kV are connected in wye-delta on a 3-phase, 18kV line. Calculate the maximum load that can be connected to the transformer bank and the outgoing line voltage
EEE 303 Assignment. The electric field intensity of a uniform plane wave propagating in free space is known to be 377e-j0.866ze-j0.5y ax V/m. It strikes a dielectric medium (εr = 9) at 30° with respect to the normal to the plane interface. Determine ..
Discuss routers in light of bridges ? What is the function of a hub? An "intelligent" hub? A switching hub? Differentiate "store-and-forward" from "cut-through" switches.
It also prompts the user to enter a letter. Complete the program by entering instructions to perform the tasks listed in Figure 13-35. Save and then run the program. Test the program appropriately.
Include an absorbing boundary at the far end of the waveguide. Excite the waveguide with an r source at the edge of the waveguide (near the PEC boundary).
Find the equivalent circuit of this transformer referred to the low-voltage side of the transformer. Find the transformer's voltage regulation at rated conditions and (1) 0.8 PF lagging, (2) 1.0 PF, (3) 0.8 PF leading.
he operation of the system requires that, before any change of motion direction, the motor must be in a full stop by push the "STOP" button Assuming bother timer TD1 and TD2 have the same preset time of 1 minute
The excitation branch impedances are given referred to the high-voltage side of the transformer. a) Find the equivalent circuit of this transformer referred to the high-voltage side.
Design an excess-2 code converter to drive a seven-segment indicator . the four inputs to the conducter circuit is (A,B,C, andd) represent it in Excess-2 code decimal digit. the inputs aredigits 0-9, so the six unused combinations are dont cares.
A steady voltage of 0.75V is applied to an op amp integrator having component values of R = 200 k and C =2.5 μF. Assuming that the initial capacitor charge is zero, determine the value of the output voltage 100 ms after application of the input.
Derive a minimum-cost realization of the four variable function that is equal to 1 if exactly two or exactly three of it variables are equal to 1; ohterwise it is equal to 0
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