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1. Suppose a chosen-ciphertext attacker cannot recover the secret decryption key for an encryption scheme. Does this mean theencryption scheme is secure?
2. Consider a symmetric-key cryptosystem in which cryptographic keys are randomly selected from the set of all n-bit strings. Approximately what should n be in order to provide 128 bits of security against a birthday attack?
The initial investment for a project is $4.7 million. A net hnual profit of $1.5 million is anticipated. Using a 12% desired rate of return on the investment, what is the pay back period for the project?
the adjoining figure illustrates a piston-cylinder arrangement. this cylinder contains helium at 21oc and 1.379 mpa.
Assuming the plant operates on the ideal vapor-compression cycle using refrigerant 134-a between the pressure limits of 120 and 700 kPa, determine
A 1.2-lb metal bar initially at 2100oR is removed from an oven and quenched by immersing it in a closed tank containing 28 lb of water initially at 620oR. Each substance can be modeled as incompressible. An appropriate constant specific heat value fo..
water at 25 degrees c enters a heat exchanger at 0.1 kgs and exits at 50 degrees c. kerosene enters the other side of
Design the springs and dampers of the system in order to have the damped period of vibration between 1 s and 2 s.
1. Is it possible for two screw dislocations of opposite sign to annihilate each other? Explain your answer. 2. For each of edge, screw, and mixed dislocations, cite the relationship between the direction of the applied shear stress and the directi..
water vapor enters a turbine operating at steady state at 30 mpa 600 oc and expands adiabatically to 6 mpa. if the
After scaling a wall, a thief drops 3-m to the ground if his body comes to a complete stop 0.15s after his feet touch the ground determine the vertical component of the average impulsive force exerted on his feet increases from zero by the square of ..
a power cycle operates between a high temperature reservoir at th k and a low temperature reservoir at tc 280 k. at
The vertical distance above the centerline of the pump inlet to the free level of the fluid surface. If the free level of the fluid is below the pump inlet, hz, will be negative and is known as static suction lift
Assuming the flow is isentropic, calculate the exit Mach number and the static pressure ratio across the cascade.
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