In this problem, we want to compare the computational performance of symmetric and asymmetric algorithms. assume a fast public-key library such as openssl [132] that can decrypt data at a rate of 100 kbit/sec using the rsa algorithm on a modern pc. on the same machine, aes can decrypt at a rate of 17 mbit/sec. assume we want to decrypt a movie stored on a dvd. the movie requires 1 byte of storage. how long does decryption take?

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.