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(四)請說明數位簽章搭配有效公開金鑰基礎建設(Public Key Infrastructure；PKI)的機制，可以保障哪些安全性？請列舉三項。【6 分】
(三)數位簽章(Digital signature)是屬於公開金鑰密碼還是非公開金鑰密碼？請說明原因及其運作原理。【4 分】
(二)請舉一個你聽過的公開金鑰密碼技術以及一個非公開金鑰密碼的技術？【4 分】
(20)** The switch on the left side of the right figure is closed, allowing current to flow through the coil wrapped around a ferromagnetic torus. Which of the statements below correctly describes what happens just after the switch is closed? **(A)** There is a clockwise increase in flux in the toroid, and no current flowing through the resistor. **(B)** There is a clockwise increase in flux in the toroid, and a current flowing through the resistor to the left. **(C)** There is a clockwise increase in flux in the toroid, and a current flowing through the resistor to the right. **(D)** There is a counterclockwise increase in flux in the toroid, and a current flowing through the resistor to the left. **(E)** There is a counterclockwise increase in flux in the toroid, and a current flowing through the resistor to the right.
(19)** A cyclic heat engine operates between a source temperature of 900°C and a sink temperature of 20°C. The mechanical work done by this engine is 2 kW. What is the least rate of heat rejection per kW net output of the engine? **(A)** 0.39 **(B)** 0.46 **(C)** 0.53 **(D)** 0.67 **(E)** 0.79
(18)** A solid cylinder of mass m is on a surface as shown in the right figure. It is attached to a wall by two springs with the same constant k. Initially, the cylinder is at rest and the springs unstretched. The solid cylinder is pulled a distance A and then released. During the harmonic oscillation, the cylinder is rolling without slipping. What is the speed of the solid cylinder as it passes through equilibrium? **(A)** A√(k/3m) **(B)** A√(7k/4m) **(C)** A√(5k/6m) **(D)** A√(k/m) **(E)** A√(k/2m)

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