information security subject

Question 4: Choice Questions (10 pts) For the following types of malwares, identify the numbers corresponding to their definitions from the list below them: rootkit: botnet: ransomware: worm: spyware: The list below gives definitions of some malware types. 1. Malware that self-propagates 2. Malware that collects information about users without their knowledge 5:20 10/26/ 4 ENG 3. Malware that holds a computer system, or the data it contains, hostage against its user by de- 11 CSC429_Spring 2020 midterm.pdf (page 7 of 9) Q Search 1. Malware that self-propagates 2. Malware that collects information about users without their knowledge 3. Malware that holds a computer system, or the data it contains, hostage against its user by de- manding a payment 4. A collection of compromised machines under a central command and control center 5. Malware that actively hide its presence from administrators by subverting standard operating system functionality or other applications 6. Malware that use fake warnings to scare users into paying for products. go ENG 10/ CSC429_Spring_2020_midterm.pdf (page 8 of 9) Q Search Question 5: Short Answer Questions (17 pts) (5 pts) Steam ciphers create a key-stream from a small fixed key. Are stream ciphers secure if the same key-stream used twice? Why (write the encryption formulas)