Question. Provide short answers (i.e., no more than five lines on average with the font size of 12) for the following items. The grade for each item is 10 points. 1. Define "Computer Security". 2. Specify the relationship between security and reliability/robustness for a computing system. 3. Determine whether the following statement is true or false, and the reason for either case: "All flaws in a computer system are in fact different kinds of attacks". 4. Define "Access Control". 5. Explain "Access Control Matrix" using an example. 6. Mention the similarities and the differences between "Access Control Matrix" and "Security Policies". 7. Discuss usages of "Symmetric Cryptography" and "Public-Key Cryptography" in security applications. 8. Specify what hash function is and explain the relationship between a hash function and a message digest. 9. Describe the processes for using digital certificates. 10. If there is no way to tell for sure that the information provided on the certificate is authentic, then provide a usable solution for it to some guarantee of trust