Exercise 5.2.1 Consider the following access-control matrix for subjects S1 S3 and objects O1 04 (the owner of each object appears in parentheses): Sub ject 01(S1) S1 read, write 02(S2) read 03(S3) 04(S4) read read S2 S3 read, write read read read read read read, write read, write Use the access-control logic to formulate the access-control rules for each object.
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- What describes how the principle of least privlege applies to the use of computers? A, It guarantees that no information inifially held in an object can be used outside its execution environment B, A process is allowed access only to the resources il needs to complete Its task and limit damage from a faulty process C, It is a process that can access an object in a domain only if that domain has a key that malches one of the locks of the object D It is the use of access controls to monitor and limit access to applications, programs, and websites during specific times of use.Create a java class to represent a log message. The log message should include the following attributes:a. The severity of the message from least to most severe: DEBUG, INFO, WARNING, ERROR, or CRITICAL.b. The name of the module that has created the log.c. The timestamp at which the log was created in the format“YYYY/MM/dd HH:mm:ss.SSS” (see java.text.SimpleDateFormat).d. The message to be logged.e. A toString() method that returns a string in the format:[severity][timestamp][name] messageS1: Deadlock can be avoided by using semaphores instead of locks for mutual exclusion. S2: Periodically yielding the processor while spin waiting reduces the amount of wasted time to be proportional to the duration of a context switch. Which of the above statements are true? Do not solve if you are not sure, i have very less time remaining. Want correct answer in few minutes
- Consider a system with the four access operations read, write, grant, and revoke. You can use grant not only to give other subjects read and write access, but also to grant them the right to grant access to the objects you own. Which data structure and algorithm would you use to implement the grant and revoke operation so that you can revoke all access to an object you own?You are tasked with the development of an E-Scooter ride-sharesystem. It allows registered commuters to approach an idle E-Scooter andreserve it, following which they use the E-Scooter to commute a certaindistance (that is not known prior to use). Finally, after the commuter reachestheir destination, they end the ride, which prompts an automaticcomputation of the ride fees. which is automatically debited using thecommuters registered payment details.Suppose the following groups are defined to shorten a system’s access control lists: – Group1: Alice, Bob, Cynthia, David, Eve – Group2: Alice, Bob, Cynthia – Group3: Bob, Cynthia Suppose the access control list for File 1 is: – File 1: Group 1, R; Group 2, READ,WRITE If Alice wants to write to File 1 giving your reasoning state whether Alice will be allowed to do so if: 2.1.1 The first relevant entry policy is applied 2.1.2 The any permission in list policy is applied
- Question 3:Consider the below lines of codeString a = “Harry”;String b = “Harry”;String c = new String(“Harry”);What can be commented about the memory locations about a, b and c? Justify your answerwith proper reasons. (Hint: c uses the ‘new’ keyword )can access control be mitigated by taking certain steps?Observe the following code and answer the following questions. import java.io.*; import java.net.*; import java.util.Date; public class TimeServer{ public static void main(String args[]) throws Exception{ ServerSocket server = new ServerSocket(9876); while (true){ Socket client = server.accept(); //blocks until a client connects PrintStream ps = new PrintStream( client.getOutputStream() ); ps.println("Time from server:" + new Date()); client.close(); } } } What type of server this is? Is it single or multi-threaded? 2. What should be done according to you if the number of clients to this server increases? Modify the server code so that the increases number of clients can be handled by this server. 3. Explain where in your code you ensured that for every incoming request from a client, a new thread is…
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