Suppose alice uses rsa to send the same messagex(e. g., her credit card num-ber), encrypted, to three companies, all of which use the easy choice ofe= 3in their public key. eve intercepts these encrypted messages, i. e.,x3(modn1),x3(modn2), andx3(modn3), wheren1,n2, andn3are the moduli used inthe companies public keys (all greater thanx). there is a method (the chi-nese remainder theorem) by which eve can use these to deduce the value ofx3(modn1n2n3). assuming this can be done, explain how eve can now computexexactly. [note: this is one reason whye= 3 is a poor choice in practice.](b) a popular choice foreis 65537. what is special about this value ofe(as opposed to nearby values) that makes it a good choice?

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

The mass flow rate of the fluid remains constant in all steady flow process. a)- true b)- false

Slip occurs via two partial dislocations because of (a) the shorter path of the partial dislocation lines; (b) the lower energy state through partial dislocations; (c) the charge balance.